Exploratory Factor Analysis
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- Опубліковано 30 вер 2024
- Exploratory factor analysis (EFA) is a method that aims to uncover structures in large variable sets. If you have a data set with many variables, it is possible that some of them are interrelated, i.e. correlate with each other. These correlations are the basis of factor analysis.
The aim of the factor analysis is to divide the variables into groups. The aim is to separate those variables that correlate highly from those that correlate less strongly.
In Statistics Exploratory Factor Analysis is also called Principal Component Analysis (PCA)
More Information about Exploratory Factor Analysis
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Here you can find the Factor Analysis Calculator
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Varimax is an orthogonal rotation, which assumes that factors are unrelated to each other. In your example, you've used personality traits, which are psychological constructs and would be expected to be related to each other (in psych, constructs are rarely if ever completely unrelated). An oblique rotation, which assumes factors are related, would normally be the most sensible choice in psychology research. The appropriateness of orthogonal vs oblique rotation for their variables/discipline is something people should be aware of and consider in EFA.
Thanks !!
It's amazing how deep a rabbit hole every step of my research is taking me into, but again I'm the idiot who decided to make my own instrument for my first research project :')
@@HQ4575 same here😭 would you please help me
I learn all this in 15 minutes what has taken 4 years and $10,000. Thanks for this. Simple,clear with no distracting loud music.
Many thanks : ) Regards Hannah
I was struggling with factor analysis and I had zero background in this. You video just saved my life, explained so nicely and such a clear visual representation within such short amount of time! Can't thank you more. Keep posting more please.
I have spent four years in learning these kind of courses and i found you. You are a life saver. Pls keep it up
Happy to help and thanks for the nice Feedback!!! Regards hannah
PCA is not EFA. You said "In Statistics Exploratory Factor Analysis is also called Principal Component Analysis (PCA)" but that's not true. Those are two different analyses. That's a common confusion, but pls, check the differences.
Thank you so much. You provided a much clearer explanation that my lecturer or any text books!
Great video! Great Explanations. This made me try the one month subscription to conduct an exploratory factor analysis. The software is easy to use and accessible immediately after purchase.
I can highly recommend it! Facilitated my research A LOT!
Many, many thanks for the nice Feedback!!! 😊Regards, Hannah
This is great!! Thank you so much!
I was just wondering why you used 3 as the amount of factors at the beginning? How did you know to use that instead of 2,4,5 etc.
This is explained in the video. Because the model output shows three factors have Eigenvalues greater than 1.
You can use the eigenvalue criterion or the elbow method. I think they are also explained in the video! Regards Hannah
Many thanks Quant Quill!
@@datatab I think that the question was: why do you set the factor levels at 3 as the first step in the PCA. In other words, why would you set the factor levels at 3 prior to creating the eigenvectors etc.? I am also curious - because in the Explained Total Variance table you have 6 factors ("components") listed rather than the 3 you selected.
In PCA, proportion of eigenvalues > 80% is also considered as third method.
Many thanks for the hint! Regards Hannah
Thank you, this has been so helpful to me. I'm a 1st year PhD student in social sciences working on my first literature review.
Glad it was helpful! Regards, Hannah
This is so simple, straightforward, and helpful. Thanks a lot!
You've done what my teacher couldn't, thank you
Glad I could help!
So, please correct me if I'm wrong (I'm revisiting the topic). When you identify the each factor, you can create a factor score for each individual by using the relevant component values in each factor and the actual individual observations, right?
Easy and clear. Above my expection,very helpful. Thank you.
Why was I able to understand all of this, this was so understandable, thanks!
Many thanks!
Loved your explanation! So easy to understand!
Veryyyyyyyyyyyyyyyyyyyyyyy helpful. that helped me so much! Thank you very much and please keep going.
Many thanks! Regards Hannah : )
What's the difference between factor analysis and PCA?
It's a good question. In the presentation, I got the feeling that the term "components" (i.e. the term used in PCA) is used to mean "factors" here. I think that the difference is that PCA is seeking to reduce dimensionality of an analysis through creating components that "summarise" a greater number of variables, whereas for EFA the goal is to elucidate explicitly latent variables.
Exploratory factor analysis seeks for underlying dimensions that explain correlations among the variables, whereas PCA reduce variables into sets of factors (Principle Components) to explain the dataset with a fewer number of variables.
I wish my stats professor in undergrad was even a tenth as good as you.
Glad you liked it!
I understood the concept communalities after listening your explanation. Thank you so much.
Lack words to appreciate your exemplary lecture!
It's my pleasure! Thanks Hannah
which one is 1 and which one is 5 is not mentioned. some times scalling starts from 5,4,3 ..1 or some times , in ascending order. which order has been followed here? i think 5,4,3,2,1 . Am I correct?
At 9:22 figures do not match your explanation. This creates confusion. Can you please check it?
Thank you very much for your clear & precise explanation. Is there any difference(s) on conducting PCA, EFA and CFA?
Yes there is a small difference!
@@datatab Thank you for making this easy-to-use software and the training material. It helps a lot.
One Suggestion: please add a button of "Select ALL" for lazy people like me. I am doing PCA & Reliability of 40 variables; but have to click them one by one after switching to one another analytical tool. thanks again.
And you follow the steps to buy in the end DATAtab... Good Marketing
hi, and thanks for the video . i wanted to ask what variance is. plz use an example . Thank u
Thanks for your question, we have a video on Variance: ua-cam.com/video/jx8a_jdlxAQ/v-deo.html
I finally understood many concepts.
Greate!
Thank you. Do we calculate the Eigean value first to assign the numbers of factor?
what you talked about was principal component analysis instead of factor analysis.
I really appreciate the videos that you are covering Test Theorie und Test Konstruktion lecture.
Many thanks!!! Regards Hannah
good. extremely useful for beginners
Thanks !!!
I just dont understand the difference between EFA and PCA then? Isnt this PCA?
this is fantastic! thank you so much!
Glad it was helpful!
What about factor loading, how to calculate that, am I missing something ?
I have so many questions that I can’t even choose the first one lol
Thank you so much for your very clear explanation
Sorry I have a question here....
If I want to perform bivariate correlations of the factors after EFA, how do I transform data from the multiple variables into data for a single factor for the correlation analysis with other factors?
Thanks for your time and attention.
Sorry for the late reply! Unfortunately, I can not answer you in a hurry, I would have to read up first! Regards Hannah
Excellent mam.Thank you so much for clear explanation
Thanks!
Really great. I have just started following all videos after watching this.
Great 👍Many thanks!
Thank you for clear presentation
Is it possible to conduct Strucutural Equation Modeling in datatab?
No sorry, at the moment this is not possible!
Thanks for the wonderful lecture.
I have a question in EFA:
The assumption that the measurement errors are not correlated between them?
This assumption isn't valid in reality ?
Hmm, I can't answer that for you unfortunately! It is true that in reality the requirements are often not taken quite so strictly!
Thanks very much for this video! Very helpful!
Glad it was helpful!
This Video was very helpful .
Can you Do a video for principal axes and maximum likelihood?
thank you for your feedback! I write it down but can not promise, there are so many topics : )
Excellent. Kindly upload videos on Research Designs
Many Thanks!!! We will put it on our To-Do List!!! Regards, Hannah & Mathias
Am I missing something here??? Why is the entire video on PCA...
Many thanks for your feedback! What are you missing?
Thank you so much! love the simple and logical explanation!
You're very welcome!
Omg you're so good. I literally cannot thank you enough!!! Thank you so very much.
Thank you so much for these videos
You're so welcome!
Great explanations (y)
Very easy to understand video. One of the best on UA-cam ❤
Glad you think so!
I have a query, the variance of the variables, for each factor, in the component matrix, is same, as the variance of the variables for each factor in the rotation matrix, I don't see any difference between the two methods, what is the difference between the two methods?
quite useful
Glad you think so!
Can i have only one factor?
pls if you are online please help me by how to analysis logistic regression with more than 13 independent variable and how to check and write interpreted report
thank you so much ... if the kink is formed below eigen value 1 then what to do?
Amazing! This is very well and simply explained. Thank you!
Hello. thanks for your video. i have a qoestion. Is it necessary to do exploratory factor analysis to perform structural equation analysis of a theoretically determined structure?
one of the best videos on explanation of FACTOR ANALYSIS. THANKS A LOT. BY HEART 🧡🧡
you are an amazing instructor, thanks a lot
I appreciate that!
Well done!!! energetic and engaging explanation! bravo
Glad you liked it! Regards, Hannah
Thank you very much for your explanation. I appreciate your work and effort.
Thanks ma'am it really helped me a lot
Most welcome 😊
Thank you a lot!! Need to review all your videos to pass the exam😂
One of the best lectures on EFA I have sat through
Thanks!
Hi can you also create a video on confirmatory factor analysis please?
very helpful. thank you
Glad it was helpful!
Hello Hannah,
can the underlying factors be seen as independent variables and the observeable phenomena as dependent variables?
Best regards!
I appreciate the simplification but EFA and PCA are two different tecniques based on different extraction methods. The data used as example require EFA but your procedure is about PCA....
Many thanks for your feedback!!! I will have a closer look at it!!!
🙏🙏🙏🙏
🙂
You are my savior. thank you so much
lol need payment
Thanks a trillion. Brilliantly explained.
Love this! thank you!
You're so welcome!
what is identity matrix? is it component matrix?
Present Yogmath
1 second ago
ua-cam.com/video/3oLt6KaJ8w8/v-deo.html
Great video! As someone who has used SPSS for data analysis, I can definitely attest to its power and usefulness. The user-friendly interface and wide range of features make it a go-to choice for researchers and analysts alike.
I appreciated how the video showcased the various capabilities of SPSS, from data visualization to hypothesis testing. It's impressive to see how quickly and easily SPSS can produce meaningful insights from raw data.
If you're new to SPSS or considering switching to it for your data analysis needs, this video is a great introduction. And for those who are already familiar with SPSS, it's a helpful reminder of all the amazing things this software can do.
Thanks for sharing this informative video!
You just saved a life.
Many thanks for the feedback : )
very nice presentation. well explained.
Perfect explanation
Glad it was helpful!
Woooow excellent video. Thanks
Super helpful 😊
help...
She's a life saver.
Thanks!
Thank you so much for the detailed explanation. This helped a lot!
Great teaching!
Glad it was helpful!
Hi, thank you very much! It reminded me a lot about multicolinearity in linear regression, are they related somehow?
Thanks. This is awesome
Thanks for the nice Feedback! Hannah & Mathias
Thanks
thank you
You're welcome
A very good presentation
Beautiful talk
Thank you
Really great
Thanks!
Thank you.
Thanks : )
Excellent....
Many thanks : ) Regards Hannah
Nice....Thank you so much..How many respondents are needed to do this EFA? Is there any literature to support this?
Im planning to do pilot test on factors that affect staff retention.But for sure, its a lot.So, I would like to lessen the factors.Thank you in advance
Many thanks. Unfortunately, I can not answer that right away! I would also have to do a literature search. Sorry!!!
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thanks for the video. this is mostly PCA , rather than factor analysis. they are different.
This is FA not PCA !
hi can i have your email address please? i have really struggling with my results and dont know how to correct them.