Quantitative Research Designs: Descriptive non-experimental, Quasi-experimental or Experimental?
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- Опубліковано 11 лис 2013
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Students often have difficulty classifying quantitative research designs. In quantitative research, designs can be classified into one of three categories: descriptive non-experimental, quasi-experimental or experimental. To identify which of these designs your study is using follow the steps in this video.
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Students often have difficulty classifying quantitative research designs. In quantitative research, designs can be classified into one of three categories: descriptive non-experimental, quasi-experimental or experimental. To identify which of these designs your study is using follow the steps in this video.
First, ask yourself if the researchers did anything to the participants. More specifically, was there an intervention?
...If the answer is yes, there was an intervention, then the study is either a quasi-experimental or experimental. I will tell you how to decide in a moment.
If the answer is no, the study is descriptive non-experimental. Sure, you could be more specific in the description of the design, but for the purposes of grouping your research in a literature review this label is often sufficient at an undergraduate level.
Descriptive non-experimental studies may also be called observational. Some examples of more specific labels include case control, cohort and correlational studies. ...
To find out if the design is experimental ask yourself if it is a randomized controlled trial. Randomized controlled trials are considered the gold standard or "best" possible design (in quantitative research). You may also hear randomized controlled trails referred to as true experiments. However, in the real world it is difficult to conduct a true randomized controlled trial in many situations, which means that a lot of studies are done that are not classified as randomized controlled trials.
Randomized control trials have three key components: a random sample, a control group and an intervention. If your study is truly a randomized control trial it should say in the abstract and/or the methods section of the article. If it doesn't say then it is likely that the study is either descriptive non-experimental or quasi-experimental. You can tell the difference by looking into the methods section further.
...If there is no control group than the study is quasi-experimental. A control group is a group of people that enter the study but do not receive the intervention under study. Instead, they are used for the purpose of comparison.
If the sample was not randomized properly or adequately or even at all then the study is also quasi-experimental. You may also see this type of study being called a non-randomized trial. ...
Sometimes I see students that are confused about the study design because of terms that relate to the length of time the study was conducted or the sampling process. ...
Terms like cross-sectional and longitudinal tell you how much time the study was conducted over. Cross sectional means that data were collected at one point in time. Longitudinal means that data were collected over a long period of time. These terms alone will not tell you if the study is descriptive non-experimental, quasi-experimental or experimental. If you use these words to describe your study design in the absence of one of the labels we discussed in this video you will not have given your teacher enough information about the study design to properly classify it.
Other confusing terms often relate to the way samples were collected, like convenience sampling. Convenience sampling means that the sample was readily available or accessible to the researchers. This term will give you the hint that the study does not have a random sample and is therefore not a randomized controlled trial, but you still need to classify it further as descriptive non-experimental or quasi-experimental.
To decide how to classify the design of a study you are looking at, follow the steps outlined in this video. Ask yourself the following three questions:
Was there an intervention?
Is there a control group?
Was the sample random?
...
You just saved me from dropping out of school. Thank you.
Lol, hahaha. I know the feeling. Good luck
lol This is part of my required class prep for grad school.
I rarely comment on UA-cam videos, but this was worth commenting on - thank you so much for simplifying it. My head has been spinning trying to get round this subject - again thank you :)
I spent days trying to understand these concepts and because of you, I finally understand! I know it is frowned up[on in the research world, but youtube is the best source for finding information on any topic.
OMG!! AMAZING FLOW CHART! you truly go above and beyond. so helpful!! like extremely helpful!
Thank you so much!!!! my peers and I continue to look forward to your videos every week!!!
you simplified in 6 minutes what my text made very confusing over 20 pages! Thank you
You are welcome. That's what I try to do - simplify complicated things. :)
So right!
Thank you for the clarity. This link was key in helping me grasp the subtle differences in quantitative research study designs.
omg life saver, i have been struggling for a few hours to identify what research design this one research is, and 1min into this video, i finally got it.... thank you
you are truly amazing. People like you deserve to get paid for your skill to simplify things. You just save me.
Thank you! Thank you! Thank you! I learned more in 6 minutes and 37 seconds than I did in hours of reading textbooks.
But she made the 6 min 37 sec video after reading text books!
Thank you for the clear, concise video. VERY helpful to a novice researcher!
You took terms that seem so complex and simplified it. Thanks!
I found your video very easy to follow and informative. The flowchart is useful, easy to follow and provided the clarification I needed. Thank you
Thanks so much for breaking it down so well for the rest of us to understand it :)
Great video! You described the concepts really well. Thank you!
Super simple and the visuals were great!! I am ready for my comp exam! Thanks!
Thnk you dr.Killam really you are such a great lecturer. You have showed me the right and easiest way to clasify research designs.
So wonderful to see you. I am stuck and this is very helpful.
Oh thank you so much!!! I was SOOO confused!!!
Excellent description!
Thank you for sharing, absolutely Incredible!!!!
Thank you so much. Perfect, very clear explanation.....
Good presentation. You made everything that has been hard to me easier
Its really helpful for me. Thanks for giving such precious information. Keep it up.
Omg made life easier thank you so much. And you have a beautiful voice. Very easy 😫😫 I wish you were my teacher
You just helped me tremendously! Thank you!
I do love your explanation. Thank you very much.
Among the best videos
Thanks really!
This was perfect explanation for help with my final project. Thank you!
You are welcome!
Thank you very much for the clear explanation. I do rarely comment but I couldn't hold myself . Excellent
I am in accounting research class, having problem with research design, thanks to your video I now understand a lot better!!!
Thank you!
+Benjamin Hanggai I am so happy it helped.
this was very helpful... thank you
The coolness with which you explained the concepts. I wished you were my teacher at school!
I am a teacher ... I hope I'm cool in person too :)
Please could you help me
Goodness, this video is very detail,now I can proceed with my paper.Thank you NurseKillman.I believe that you should give my professor a refresher course.
I'm happy you found it useful :)
This was really helpful. Thank you
I wish you were my research professor , YOU would make me love research :D
Thank you ... very easy to follow and understand.
Thank you :)
My professor recommends your video for our class, and it was extremely helpful!
Thank you :)
+P CARRETE awesome to hear!
@@NurseKillam Me too! thank you!
thanks for the simple explanation
Thanks so much for simplifying a subject that has been challenging me for the last several weeks. I wish I would have found you sooner but think I can now address my professors questions with much more intelligence and insight.
That is so awesome to hear. Thanks for the feedback. Knowing that the videos are useful is what keeps me making more :)
This video was amazing and helped to make Research not so confusing! I even shared this with my research class. Thanks so much!!!
+Seth Mule Awesome!
Thank you...very helpful!
Now I am Applying It! Thanks Sis......
Thanks you so much.. I don't want to drop my class this is so difficult to understand and you made it so simple. 🙌👏
Keep up the video. I will like and subscribe.
Very helpful, thank you for your time
Thank you for such a informative lesson
You need to write the research book.!!!!The reason why everyone finds research difficult its because the books are written by someone who know research well not taking in consideration others like us who have no clue. Thank you for sharing your teaching expertise.
This has been of great help! Thank you.
You are welcome :)
Thank you so much for your short but very effective video. I am really benefited. As I have an exam. it will be helpful for me.
I'm happy it helped. I hope the exam went well.
veryhelpful and easy to understand
Very effective. Thank you!
This was SO helpful. I knew the heart of my research design but I didn't really know how to approach the description for the methodology of my design. I couldn't distinguish between correlational or causal-comparative or not. After watching this, I know my particular design is neither of those. THANKS!!
+Daphyne Shine awesome! I hope you figured out what it is as well :)
Thanks, it is very brief and clear. I will use this for the introduction of quantitative research in my class. I hope you wouldn't mine.
Excellent video, way to simplify it all.
Thank you
Thanks, Helpful.
Thanks! ma'am
Excellent ! Thanks!
Thanks for sharing, this video was very helpful.
I'm happy it helped.
Thanks, I appreciate your help.
+Hello-Kitty08 Anytime - I try to respond to comments once a week but sometimes it takes me a bit longer.
Very Clear an informative
watched another one, thanks again
such a good explanations,tq
So helpful! Is a questionnaire considered an intervention? Thank you for your assistance.
Thank you for the video. Really helpful!!!
Awesome to hear
thanks for this! :-) have watched it several times...you're a great teacher and explainer.
Thank you. I'm happy you liked it :)
Thank you!!!!!!!!!!!!!!!!!! 🥰🥰🥰 This is what I needed!
THANK YOU soooooo much for clarifying this research "french" for me.....
You are welcome ... Most of my students call it Chinese ;)
Thank you!
Thank you for this information. What type of data collection can I use for if colour code charts work in hospitals?
Absolutely EXCELLENT video!!!!!!!!!!!!!!!
+Book Lover Thank you. What did you like best (so I can keep doing it)?
Designing my own research for the first time and I must say working out the study design, the size of the sample, statistical power, choosing the right measurements and so on can be daunting! I found your video very helpful although I am still unsure of what to call my study?! :D
It's true it can be hard to think through everything but it is such an important step. Have you tried talking to some experienced researchers near you? Are you in school? If so your thesis supervisor can help. If not, try making friends with someone at a university that is interested in the same thing you are. Sometimes just talking it through helps.
I am in my second year of psychology at university. You are right, by talking to others I about it helped a lot so I started to network.
So helpful. Why cant they teach it like this. SMH So helpful for my assignment.
THANK YOU SO MUCH
thank you
thank you!
this is so beautiful! i hav had challenges in understnding this but u hit it right on point! thanks. i would like to learn about the phylosophy of science the guide different types of research
I'm happy you liked it. I've got a few more philosophical videos on my channel in a research playlist you may also find useful.
You are amazing, and that is a fact!
yr videos are great, thanx!
Glad you like them!
I am so glad that I have found you. The article that I am critiquing uses a prospective cohort study, there are no intervention. Before terming the quantitative method as non-experimental descriptive, how do you know its descriptive?
Hope to hear from you soon.
Basically if there is no intervention it is descriptive. If the researchers didn't DO anything to participants - like give them drugs or education or a new treatment of some kind.
I'm a novice researcher. Is there any way you could place your videos in order as to what you think would be first to watch and following starting with quantitative research?
Hey @Nursekillam love your vids, they are very helpful. Could you tell me how to figure out the population in a study if it was 3 trained research assistants watching videos of 2 TV shows to mine for data for a quantitative study. Would the TV shows be the population, or is there no population? I'm so confused.
Are they trying to generalize findings to the TV shows? If so that would be the population. I'm thinking they may be watching them to generalize findings to the people who watch them. It's hard to say without seeing the question.
Thank you! God bless.
This is too informative. A+ I just notice one thing. Instead of controlled, you wrote down "COMTROLLED"(5:57) . Guess what? That did not stop me from getting the information needed. I considered it just as a typographical error.
so helpful. thanks so much!
+ibaan district you are welcome :)
Thank you for sharing this video. It was a big help! I have a couple of questions though... Is it convenience sampling in a school setting where the researcher has to get permission for students to participate in the study when only a few students give permission to participate? If it is convenience sampling and students are randomly assigned to groups does that make the study experimental or quasi experimental? Thanks for your help.
+Hello-Kitty08 What you described sounds like convenience sampling. There is a difference between random sampling and randomization. Random assignment to groups is what differentiates a true experiment from a quazi-experiment. You can have a RCT with a convenience sample (although you would critique that it decreases generalizability).
wow, it was great explanation. Thanks
You are welcome
thank you so mcuh
Hello, I am in a graduate course examining the difference between research and evaluation, and wanted to ask for your thoughts on what the differences are, but also what similarities both might have. Thank you.
In my experiment, units are selected in random and there is no control group.It is pre-post experiment and my pre observation act as a control group.can i categorized as quasi experiment. what is the best sample size fro such experiment which would use non parametric method? Useful flow chart and thank you for best explanation.
thanks for study
What about correlational? Thank you for your video?
typeo at 6:03 - comtrolled - should be controlled?
Hi nursekillam. thank you so much you do not know how discouraged i was until i watched your video.And iam some what know clue about the quasi -experimental. But my colleagues can help me how i can related the title of ,the impact of market oriented beekeeping on house hold farm income .
I'm happy it helped. Let me know if you still have issues figuring it out.
My current teacher and the textbook she uses told me information that contradicts this video. According to them, for a study to be experimental it is only necessary that assignment to the experimental or control group, not sampling, be random.
+Eufinity she is right. What I talked about is ideal but if I did this video again I'd make that clear. Thanks for pointing it out. I don't know if I can do anything to this particular video to clarify that but I will try.
Dear, NurseKillam .
Very awesome video.
May I use it for my students who are learning about research methods?
best regard,
Rif'at
Yes, please use my videos any time you want to.
Laura
Thanks for the videos. I teach online and I often post your videos (with citation of course). Do you have any videos about spss software?
I am happy you like them. No, I do not have any on SPSS. I can't do that kind any time soon (I don't even have SPSS ... When I need it I ask a statistician for help).
Is there such a design called a quantitative case study? I saw this in an article.
this is very useful video described in simple manner... how can we access to other videos...??? pls send the links
+Dilan Seneviratne If you click on my name/picture it will take you to my channel where you can find all my videos. ua-cam.com/users/NurseKillam
Please i need help .. if i have a data of qusai experimental
Qusai experimental non equivalent control pretest post test design...
Which statistical i will use for this...
Kindly let me know
Hello,Your video was extremely helpful.
I am doing some research on alcohol consumption in pregrnancy in relation to post partum depression, in this case I want to do purposeful sampling and divide the mothers who consume alcohol in one group and who donot consume alcohol in other group. I think ramdom sampling cannot be done here. However, I want to put both the groups under same test giving equal chance with same intervention to find co relation. So, is this a quasi experiemental design or not ? If not then what is my research design.
Please advice me soon if you have time.
Thank you
+Manish Bharati You are right that random sampling would likely not be possible. Can you randomize to groups in this case? It depends on the ethics of the intervention. I can try to help but I don't feel I have enough information to understand the study proposal.
If you want to do an experimental study your sample is likely going to be a convenience one rather than a purposeful one.