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Loren L. Toussaint
Приєднався 16 жов 2011
How to export, save, and submit SPSS homework
How to export, save, and submit SPSS homework
Переглядів: 229
Відео
Computing Scale Scores in SPSS using Syntax
Переглядів 9 тис.10 років тому
Shows how to compute scale scores from a questionnaire in SPSS using syntax
Multiple Correlation and Regression Analysis in SPSS
Переглядів 105 тис.10 років тому
Shows how to do multiple correlation and regression analysis in SPSS.
Computing Scale Scores in SPSS
Переглядів 325 тис.10 років тому
Shows how to compute scale scores from questionnaire items in SPSS. Recoding, coefficient alpha, computing scores.
Mixed Model ANOVA in SPSS
Переглядів 52 тис.10 років тому
Shows how to do a mixed model analysis of variance in SPSS
Repeated Measures ANOVA in SPSS
Переглядів 1,1 тис.10 років тому
Shows how to do a repeated measures analysis of variance in SPSS
Two-Way ANOVA in SPSS
Переглядів 74110 років тому
Shows how to do a two-way analysis of variance in SPSS
Explore in SPSS, Histograms, Stem-Leaf, Box Plots
Переглядів 2,4 тис.10 років тому
Explore in SPSS, Histograms, Stem-Leaf, Box Plots
can I correlate 4 variables?
Since time has 3 levels and Mauchly's is significant with Epsilon valued at >.750 wouldn't we need to look at Huynh-Feldt instead of sphericity assumed?
What does unique predictor mean? Can I also know the individual correlation of the X variables to the Y variables? And I have known confounders (from previous study) but I am not sure wether I should put this in the analysis as well as X variables?
hi, sir. how do i use correlation for a relationship of SCIENTIFIC ATTITUDE (X1) and LEARNING INDEPENDENCY (X2) with SCIENCE PROCESS SKILL (Y). should i use regression? the hypotheses on my research is to know the simultant Relationships of the 2 independent variabels with 1 dependent variabels.
I loved that I saved myself the trouble of digging through a whole semester's worth of grad school notes from 8 years ago by watching a 2 1/2 minute video! Thanks so much!
Warms my heart to hear this! Thanks for your kind words. I hope it was helpful.
Hey , thx for this video ! Interesting! I´m looking for a forecasting method that would consider : two correlated data sets A and B , seasonality of data set B and trend of B to predict future B figures :Winter´s method uses only 1 data set , although it is excellent for seasonality and trend but it doesn´t take into consideration the correlation with the data set A, any idea how to solve this ? Thanks in advance !:)
sorry I can't be of much help here... this sounds like some econometric analyses. seasonal analyses are well beyond what multiple regression can handle. sorry.
Thanks for your quick reply!@@loren.toussaint
Hey Loren, for my Bachelor-thesis I am doing resarch on 2 groups at 3 different points in time. First the entry level in 3 different motor tests are measured. Two of them include the stability of the knee-joint and one conductes the soccer-specific skill of dribbling. After the entry-level measurement group 1 undergoes an intervention-programm, while group 2 functions as a control group for one of the motor tests. The intervention runs for 4 weeks before testing both groups again. Then groups are switched so that people first assigned to the control group are now undergoing the 4-week-intervetion-programm and vice versa. I now want to find out which effects of the intervention can be analyzed for each group and the seperate time-levels (1-3). Do I have to do additional tests after the mixed ANOVA or do I extract these findings from pairwise comparisons? - Thank you for your work, really helps.
You would typically do pairwise tests between groups at each time point. Or, you could do pairwise tests between time points WITHIN each group. Or, you could do both. Assumptions of these approaches and type I error inflation implications differ in each case, but those are generally the options. You're right on track!
Thank you for the reply- I'm focussing on the pairwise comparisons within each group since the output of the ANOVA was non-significant for the between factor. Really appreciate the help. What do you mean by the different assumptions though?@@loren.toussaint
@@thatguyvince5703 so you would not want to use the between effect as a gateway to doing t-tests between groups. the overall between effect is an AVERAGED effect that will likely be nonsignificant because at baseline there shouldn't be a difference and this is averaged into the between effects across baseline, post and follow-up. do the between comparisons anyway. if you do the within comparisons. there are assumptions of any statistical test (often normality, homogeneity of variance, etc.). I would review them from a trusted text or website for both independent and dependent t-test as well as mixed anova.
Thanks again for the help. The output from the mixed Anova shows the pairwise comparisions between and within effects already or am I wrong? By the way I have an significant interaction effect of Time x Group while main-effect of time is also significant and main effect of group is not. Would it make sense to explore the main effect of time anyway or should I just focuse on the interaction effect? If I decide to analyze the within-effect of time further which t-test do I use since the same participants are measured but groups are switched? I also think I need to split the data-set in SPSS for the group-variable in order to conduct the t-test. For me the only reasonable answer would be a paired t-test I think to explore at which point in time differences can be found.@@loren.toussaint
@@thatguyvince5703 Oh, sorry. Yes, if you have requested the between and within effects, then they should already be there. I'd use those. If you have an interaction, you should focus on that in your interpretation, not time or betweeen groups effects. Yes, you are correct that you need to look at changes over time WITHIN each group OR differences BETWEEN groups at each time. You can request those tests in syntax I believe or do it by splitting by group.
Veri informative
Thanks a lot
hi how do i make correlation between TFC, TPC and catalase activity? 3 of it are numerical
can you explain more what these variables are and which ones are predictors and which one is the outcome? what is your hypothesis?
Hey, How can i find the correlation between FINANCIAL LITERACY(financial literacy has 3 main determinants i.e. financial attitude, financial behaviour and financial knowledge. So, statements from determinant was given.. The variables are FA1,FA2,FB1,FB2,FK1,FK2) and INVESTMENT AVENUES(bank deposits, stock market etc) Please reply🥺
You are in the right place. You want multiple correlation and regression. Follow the video I've posted but use fa1, fa2, fb1, fb2, fk1, and fk2 as the predictors to predict each of your outcomes. One model like this will be for each outcome of interest. So, predict bank deposits, then stock market, then whatever else. Separate model for each outcome. This is manageable. You can do this. Stay optimistic! 😁
@@loren.toussaint Never thought you would reply, was searching for your profile all over the social media for asking this, thankyou so much!🥲❤️
Thank you for these helpful videos! We are senior students working in our graduation research. So we're asking you if you don't mind, can we send our plan for the analysis to you to check if we are in the right track. Thank you
I really shouldn't get too involved in your coursework requirements. That is something you should discuss with your professor mentoring your research.
Is it necessary to maintain same no.of levels in each variable?
no the variables can have different numbers of response options. that is fine.
@@loren.toussaint Thank you.
how do i use correlation to measure the relationship between educational qualification of parents and marks scored by students ? Can I able to use Multiple Correlation and Regression Analysis
if parent education is just one variable, then you can use Pearson correlation with student performance. If you have father's education and mother's education measured separately, then yes multiple correlation/regression would work best.
@@loren.toussaint Sir Thank you so much for your reply its helps me a lot and I fo have a doubt sir. Since father's and mother's education is qualitative variable more precisely ordinal variable, Can I able to use correlation or multiple correlation/regression?
@@aishwaryar1998 that should be just fine, especially if father/mother education has more than 4 categories.
@@loren.toussaint Yes sir I collected the data like Business,govt employees,private employees, industrial works like that sir. Thank you so much for fast reply and clearing my doubt sir❤️. I actually doing college project it helps a lot sir!!
Hi I have a question. How do i measure the Parental Authority Questionnaire using SPSS? I am confused as it does not depend on the total scores but there are subscales: Permissive/authoritarian etc. Please help me out if you can! Thank you.
Hi Marshyani, All you would need to do in this case is simply compute each subscale score the same way that I show you how to compute a total score. In other words, you simply have several "total" scores.
How do i use correlation to find out the relationshio between productivity and profitability. In which I have 9 variables under employee productivity and having the same number of varuables in profitability. In another one, having 5 variables under capital productivity and 9 number pf variables under profitability. How to do correlation? Is it okay to go with correlation? Or any other methods?
You can use all of your productivity variables to predict profitability, but you have to use only one indicator of profitability at a time. In the first case you will have 9 models each with the same predictors and the 9 different outcomes of profitability taken one at a time in different models. Then you will have 9 different models with 5 predictors each. A separate model for each outcome is what is needed. Hope that helps.
Hi! Thank you for this content this literally helps a lot. Aside from the presentation. How can I correlate a scale with another scale or variable considering that each scale contains a lot of questions?
You should combine the questions into a scale score using this video here and then see my video on correlation of two scale scores: ua-cam.com/video/Kis6IwuqKjc/v-deo.html
What if normality is violated and transforming doesn’t fix this? What is the non-parametric model?
First, we need to be clear that it is the normality of the residuals that is of interest. There are also several other assumptions of mixed model ANOVA. I found this link helpful: psych.wisc.edu/Brauer/BrauerLab/wp-content/uploads/2014/04/Murrar-Brauer-2018-MM-ANOVA.pdf. If assumptions are not met there are varying degrees of concern, depending on which assumptions are not met and how badly they are violated. I think you're going to find that the search for an exact nonparametric alternative is going to be a relatively difficult one. I might consider looking into generalized estimating equations, if needed. Hope that helps.
@@loren.toussaint thanks a lot, will have a look into this
bless u
Thank you 🙏🏾
Why do you compute the average?
you can compute average or sum. its just the way to create a scale score from individual items.
@@loren.toussaint Is there a benefit to average over sum or sum over average? For example if I want to check if there is a correlation between a persons occupation and a 10 item questionnaire?
@@SkidMcmarxx generally no difference. However, if there is a small amount of missing data, you might save some cases from being deleted by computing the mean (which is unaffected by the missing data). For instance, a person who answers 9 of 10 questions will have a lower sum score because they have one less item to add to the sum, but if you average the items the average is unaffected by having 9 or 10 responses. If you choose mean, you'll have to choose a cutoff where too much missing data means you can't compute the mean. Often that is determined to be 50% of the items, so anyone with 5 or more responses, you compute the mean, anything less and it is missing. I hope that helps.
@@loren.toussaint Yes, thank you so much.
Thank you! I am drowning but now drowning a bit less
Hi! Great video! I have a question though, how can i combine the total scores of the subscales to get the total score as a whole and create a new variable?
Typically you would sum or average all items and not divide them by subscales. Hope that helps.
How do we report the results of a mixed MANOVA?
I think you're probably referring to a "doubly multivariate" design and analysis in which case you'd want to report the lambda, F, dfs, and p value (eta squared for effect size). tables of means and sds, or a figure would usually accompany this.
Hi. I'm trying to do a correlational study using 3 variables. Data for all three variables were collected using Likert scales. Therefore, I just wanted to know to convert the data from the Likert scale into a variable form so I can run a normality test and correlational test on it? In the video, at the computing part would I have to compute the mean scores of all the items or the median score or the sum?
typically you would compute the mean of the items to arrive at a variable score
Thanks for the video! Aside from what you mentioned about missing data in the comments below, is there a reason it is better to use the mean when calculating the score instead of a sum if you are sure there is no missing data?
If there are no missing data, then mean and sum will be equally useful. No advantage to one or the other.
@@loren.toussaint thanks!
Do we use this mean column to go for further analysis like correlation ?
Yes, that is correct.
Is Sig. in the Anova section the p-value? How about if I have two IVs, two Moderator variables, and one DV? Please help with the second question
ANOVA significance is the significance of the overall model. Look at the sig (p) value for the individual predictors (X variables) under the "coefficients" table. It has the t value from the t-test next to it. for a moderator model, you must multiply X1 and X2 and then enter X1, X2, and X1*X2 all in the same model and look at the sig of the X1*X2 variable. you must only look at the sig of X1 and X2 when X1*X2 is NOT in the model. Once you add X1*X2 into the model you can only look at sig of X1*X2.
how do i use correlation to measure the relationship between microfinance loans and living conditions such as education, health and food consumption?
put microfinance loans in as the dependent and education, health, and food consumption in as the independents. That should do it. Best of luck!
Hi what do I do if I ran the reliability test but it displays the message ‘the value is negative due to a negative average covariance among items. This violates reliability model assumptions. You may want to check item codings’ even if I have reverse coded? I am using the Rosenberg self esteem scale please help I’m so bad with stats! :(
Hi Zay, Even if you believe you have recoded correctly, it is possible that due to some other factor the scale is not reliable. usually it is an item or two. I am familiar with the RSE, but I'm not sure why this is happening. However, there are difficulties with reversed items when English scales are used in other cultures.
Loren L. Toussaint hi thanks for your reply! How can I tell which items to get rid of?
Loren L. Toussaint I have recoded the correct variables and it still isn’t working, are my items labelled wrong? My values are 1= strongly disagree 2=Disagree 3=Agree 4= strongly agree I think recoded these for some of the questions as stated by the RSE. I am entering the values as items is that incorrect?
@@hanik8918 sounds like everything is correct. Try getting alpha for just positive worded items (not reversed). Where (what country and language) are you using the scale?
Loren L. Toussaint England, United Kingdom!
Hello, thanks for this video, can I use the mean scores as datas for computing ANOVA?
Yes, this is exactly how you should use these scores.
@@loren.toussaint thank you!
Hello thank you so much for you great videos I just have one question is this another way instead of using transform? Or it is something different
transforming is something different altogether. this computes a scale score only.
i just wanted to ask how i would use this in a linear regression, if i wanted to dummy code my variables for the regression when the mean totals brings up decimal places that are not represented by anything i guess would i then consider the scale as a continuous?
this should work fine. dummy coding will distinguish between say males and female and if the unstandardized coefficient is for instance .75 it means that moving the male (coded 0) to female (coded 1) on X corresponds to a .75 increase in the continuously measured dependent variable. so, females are higher than males. if the coefficient were -.75 then males would be higher than females.
thank youuu!!!!!!!!
You are welcome! Glad it was useful!!
@@loren.toussaint i was wondering what you would do if the scales are different so for example one is on a 5 point scale while one is at a 7 point scale, this is for a uni work so im sure they added that on purpose
@@laaaaaaaa533 I'd probably standardize the items first, then compute a scale score. There are other methods, but standardization is meant exactly for this purpose--to make two different response scales equal.
@@laaaaaaaa533 yes. Standardize items, then compute scale scores, then do regression analyses. In that order.
@@loren.toussaint thank you soo much really grateful
Hi, so would this be described as a 2 x 3 (programme x time) mixed method or a 3 x 2? How do you know which way round they go?
correct. it can be described in either order. doesn't matter.
Hello, thank you for a great tutorial. If I want to compute the total score for each respondent, instead of total mean?
at 5:13 in the video simply name the variable something like "total" and then in the numerical expression box you can do either item1+item2+item3 OR you can write sum(item1,item2,item3). Either should work. Be careful using sum if you have missing data. Sum will sum whatever items have data and will ignore if other items have missing data. If you use the first approach and there is missing data on even just one item, you will have a missing value for the total score.
I want to calculate the Hmailtion depression scale 24 variables and then to categorize it to four categories ???????
Hi, you should be able to use the video and the scoring instructions you find on the web or in this article: Hamilton M. Development of a rating scale; for primary depressive illness. Br J Soc Clin Psychol. 1967 Dec;6(4):278-96. I don't know the HAM-D as well as other depression measures, but it should be pretty straightforward. That is, sum up the relevant items to obtain a total score. Creating categories is another matter, and you'll likely have to see the article or other articles to find the cutoff scores. To create cut off scores you would need to use "if, then" syntax like below: if(hamd<5)newvar=1. if(hamd>=5 and hamd<10)newvar=2. if(hamd>=10 and hamd<15)newvar=3. if(hamd>=15)newvar=4. You will have to find the right scores to fill into the syntax above. Then paste this into a syntax window and execute the commands. I have a video showing how to run syntax too.
Thanks!!
Thank you! :D This was a great help for computing scores for a quiz I am doing for my undergraduate dissertation.
Awesome! Glad you found it useful!!
Hi, thank you so much for been very helpful.
This helped me so much finding an average scale positive for my applied stats class! Thank you so much for doing these videos!
So glad to hear it! Thanks for your kinds words!!
Hi. Is there any ways that I could contact you? I have several questions regarding my study and i'm not to sure on how to score the questionnaire. Looking forward to your reply. Thank you.
you'll find my email on www.luther.edu/touslo01. you can email me directly if you like. you can also find me on ResearchGate.
hello, thks for this video. i have a question: if the scale is multidimensionnal, does it make sens to calculate a score for the whole scale? if it is, how to compute it? is it the average of all items in all dimentions?
In many cases it does make sense to compute a total score and you would do it just as you have described. Sometimes scales don't have total scores and it is always best to refer to the original article where the scale was first published or refer to the test manual if it is available. Hope this helps.
Loren L. Toussaint thank you so much. Few years ago, I started to write a paprer (that I gave up) and I had to deal with something like that. When I performed PCA analysis for trust scale it always showed 3 dimensions (credibility, integrity and goodwill) and I asked myself if it was right to compute a total score of the (3×4) items and talk about trust ...
I think that would be just fine. Its common to do so.
Hi, we are doing a research with 2 different groups (Group A and B). They undergo the SAME intervention (a rehab program) and we let them take a survey before, during and after the intervention. During and after the intervention, we expect group A scores better on the survey than group B. Will this 'mixed model ANOVA' work for our experiment? Our within subjects would be the time we take the survey and our between subjects consists of the two different groups.
this sounds exactly like what you need! Good fit of this statistic to your design.
Thanks! Very lucidly explained.
Ah, excellent video. Very good teaching! Thank you!
thanks for sharing, the video was helpful alot. 1'm running a similar analysis, i hope i can consult whenever i want? thanks again.
hope to help as much as I can. :-)
so this method is available to give for example the variable of "attitude" a score based on 4 items ? and so to use it for the regression after or the test of KHI2 ?
correct. not sure what you're referring to regarding KHI2, but your understanding appears to be correct.
what does the mean of an item represent?
its the same as a total score on a test. it represents if the person is high/low on given construct.
Hi loren. Do we have a cutt off score that differentiates between a high/low score? I have an instrument with 6 items and a 5 point likert scale. How to i determine a cutt off score? or if its continuous, as in the person is high/ low on a given construct, is there any specific point (number) to differentiate them?
Hello there. I want to know that after running analysis i have an output sheet in which i have analysis report. Now i want to know that which values from output i have to put in results section concerned to item total corelation of scale. Like i cant understand......urgent help. Please
generally all you need to include is the coefficient alpha value itself and typically alphas of at least .70 are expected. you typically woudn't include the item-total correlations in a formal paper or report. hope that helps.