I love how Dr. Grande explains ALL of the results on the output from the ANOVA and post hoc. It really helps to solidify understanding how and why we run the statistical tests we run and what the results actually mean. For example, taking the extra step to explain that there was no statistically significant different between CBT and existential.
Thank you for sharing this video Dr. Grande. I used this type of testing for my senior thesis in undergraduate. I appreciated how it shows each groups significance compared to the control and experimental group. It was easier to understand and work through the information, especially when you are not confident in understanding the statistics.
I have taken a statistics and research methods class in undergraduate school which is why I remember a lot of the terms that you are talking about. However, I forget a lot of their meanings and how you determine the results. I'm looking forward to being able to read the data again and know when their is a significant difference. I also really liked the use of the Mean Plot. I have never used that before and seeing a visual plot presentation of the data made it easier to understand what you were talking about.
Prof. Grande has maintained the balance in his videos. He touches all the points, at the same time goes very focused and fast. Whenever I am searching for any video on statistics, my eyes search for where is Prf. Grande's video.
Having little to no understanding of SPSS and the material being presented, I was confused at times by the information given. However, as someone who is unfamiliar with the material, I found the visual presentation to be helpful and easy to follow, allowing me to get the gist of how to properly perform a one-way ANOVA. With more practice, I find that I will gain a better understanding of the information.
Thank you for this video! Very easy-to-follow video about assessing differences between two treatment groups and a control using a one-way ANOVA. I enjoy that you always run through what the statistics actually mean with respect to the test and significance.
It was interesting that the ANOVA can tell you if there is a significant difference between groups. However, one must interpret the post hoc test in order to see where the difference. SPSS makes this very simple and I'm glad Dr. Grande shows us two ways to get these results and some additional tests.
I chose to watch this video because I'm narrowing down my methodology for a research project...this helped greatly in assessing what I need test-wise in comparing three groups with different independent variables. Thank you!
I too am trying to figure out which statistics to use for my project. While I do not think I will use this one, this video has contributed a bit to my overall understanding of ANOVA
I vaguely recall running these tests during my undergraduate research course, but was slightly confused. I recognized a few of the functions and felt the video did a good job demonstrating various ways to analyze and view data; however, I think further hands-on practice in SPSS would be the best way for me to fully understand these functions.
I remember doing ANOVAs in undergrad and I faintly remember liking them because I understood them at the time. Many things go over my head now, so to fully understand, and not mess up if I do it myself, I would need to watch the video a few times to feel comfortable, although this video did a great job with explanations. Although it was a lot of information, it was all beneficial information.
One way ANOVA's seem to be used a lot in research and it was interesting to learn how to run this test in two different ways. I had learned the first way in undergraduate and was excited to see that there are multiple ways to run a One way ANOVA. Multiple options are always great!
The speed of the results in both Excel and SPSS are astounding... hard to believe how quickly it runs these tests. So I've learned that an ANOVA test will tell you if there is a "between group" difference but the Post Hoc results show you where the difference is. Also, you have to have statistically significance in your ANOVA analysis in order to interpret a Post Hoc test. Still trying to wrap my head around all of this :)
Kimberly Hanna Yes, SPSS and Excel are great tools and it would be odd for anyone not to use these if they are doing a lot of statistical analyses. Of course, one must understand these tests so it is good that we have these videos to explain what the tests mean!
Use one way ANOVA to compare differences in scores between groups and use post hoc to see where the differences are. Thank you for the video Dr. Grande.
This video presented a lot of information in a short period of time which made it a little bit confusing, however I appreciated the description of how to find the statistical difference.
This video showed a lot of information. I think it is interesting how many different statistics are shown after running the test. The hard part for me will be remembering what all of the statistics mean and what they represent.
Rachel Foster There was a lot of information covered in this video that I did not understand. It is hard to follow at times since I am not familiar with SPSS. I like how the results are shown and and can be computed so simple, but if I don't understand how the information is computed it does me no good.
Bethany Elstrom I also need a refresher on the meaning of terminology and uses. Also, the new SPSS looks so very different that I would need to re-learn it all over again. The videos are helpful for that.
There was a lot of information in this video surprisingly all packed in the 7 minute video. It was interesting to see all the explanations spelled out and seeing it in action.
Admittedly I am a nerd and ANOVA's are probably my favorite analysis to run. I like ANOVA's because, you can compare the means of more than just two samples which is really helpful for most research projects. Again, this video served as a good reminder to me of how to interpret the read out from SPSS Great video!
Mandy Moore I vaguely remember ANOVA, but still don't exactly know what it is..... I know that it is helpful, but to understand things I need to know what they are and for this, I'm still lost on that.
Thank you for posting about the Brown-Forsyth and the Welch in the next video, it helped to further understand this video. Also, I appreciated seeing the two ways to run a one-way ANOVA, although the first example seems the more obvious choice.
Dr. Grande, hope you could make a book in SPSS with details such as in the video. I have learned a lot from this and it helped me in my results and interpretation in my dissertation paper.
I can see this formula being very useful in research when comparing two treatments. I would hopefully be able to use it during my hypothetical research.
Susan Wilder It does look helpful, but I'm still not completely clear how this works... I don't think I know it well enough to use it on my research proposal.
I really hope that you will consider producing some updated videos for SPSS Version 25; as some of the menu options have now changed ; for example Levene's Test now displays four different statistics: based on mean; based on median; based on median and with adjusted df; and based on trimmed mean. Also, tests for heteroscedasticity are now available from the menu system in Univariate analysis.
Very powerful and a lot seems to be going on. Are there any checks, factors or rules regarding selecting the various options in the options dialogue box and the post hoc dialogue box?
I did not remember any of the ANOVA and Post Hoc Testing. This was a lot of information to take in and comprehend. I would need a lot of hands on to use this, but I did see the significance of the results and the analysis that was provided.
Bethany Elstrom I did not learn about ANOVA and Post Hoc Testing in undergrad. For me, this was new information and I found myself lost. Like you, I did see the significance of the results, yet found myself wondering how Dr. Grande came up with the data.
I also did not remember what the purpose of using ANOVA and Post Hoc Testing in the video were for. I was confused with the multiple presentation of charts at once. Hopefully, watching more videos that explain ANOVA and other important research concepts used in SPSS will help me to understand the information.
Oh wait I have a question. Why is CBT more effective than Existential according to the graphic in 4:50? What did it base on? And for the post hoc test, what is the difference between Tukey and Duncan test? I used Duncan test but after seeing your explanation I think I could use Tukey test as well, I'm just a little bit confused on how to interpret it. Thank you.
Sir, Thanks a lot for the video. But I have a question. If the number of observations in each group differs what test to be used for post hoc analysis?
Your videos are valuable sir..but i have one doubt..is there a non parametric equivalent for two way anova and what are the posthoc tests to be used for kruskalwallis test. Thank you in advance
I was very confused!!! I am not familiar with the ANOVA function. However, using SPSS to organize the data seemed user friendly. Also the SPSS table made the data much more easier to understand. Finding the statistical difference between levels of independent variables seemed pretty straightforward using SPSS.
Hello Prof. Can i do one way Anova with individual Likert items (Measured on 5 point scale), which are part of a formative construct in my study? I am confused whether i can go with ANOVA, as Likert items are ordinal in nature. Request you to please clarify and provide an appropriate reference.. Regards, Karan
The chart with the line graph that was labeled "mean of posttest" was the easiest chart for me to visualize and to understand the differences in scores between the control group, CBT group, and Existential group. This is probably due to the fact that looking at numerical data tends to confuse me. I also found the second method of performing a one-way ANOVA and interpreting the post hoc test results to be easier and quicker.
I was a little lost in following this video, I think I struggled with just trying to keep up with what was going on and the purpose of it all. The separation of the data, having it in its own boxes helps to compare and contrast data. I like that you can have multiple samples, this would be beneficial in research in order to see what treatment was most effective.
Candace Fernandez Yes, definitely confusing! But I think with further practice we could figure it out. And it's certainly useful to have this video provide step-by-step instruction!
Candace Fernandez I agree with you. I can see the information being very helpful, but it is also difficult to remember what each statistic stands for and how it is used. There was a lot of information being shared in the video, which was overwhelming when confused by the statistics.
I have 10 measured Toluene concentrations from 10 sampling points. P1-156.4 mg/kg P2-128.2 mg/kg P3-1201.45 mg/kg P4-1125.1 mg/kg P5-1225.85 mg/kg P6-879.23 mg/kg P7-458.8 mg/kg P8-695.5 mg/kg P9-205.36 mg/kg P10-1552.3 mg/kg The recommended Dutch Intervention Value for Toluene in soils is 130mg/kg Which statistical test can i use to show whether there is a statistical significance between the measured concentrations and the Dutch Intervention Value?
This video was helpful ans I was able to understand ANOVA one way better.i also had a more clear understanding of the different levels that are being measured and compared .
I am still struggling to determine when the best time to use the ANOVA is. This video helped with the steps and the process but I could use more help on recognizing when.
I remembered the term ANOVA but it will be difficult to recall all of these terms and their meaning. This video was jam packed with good content, however again I need a deeper refresher I believe.
There is a lot of information that was shared in this video. Some things I feel like I understood and some other things were really confusing. I am pretty unfamiliar with ANOVA so some things went over my head. I think that I may need to revisit this video again in order to try to grasp more of these concepts. I can see why it is useful to use the one way ANOVA and Post Hoc tests when conducting research, I just need to be able to put it into context.
Melissa Clendaniel I've noticed that any video with ANOVA tends to go over my head as well. I tried watching this video and left with more questions than answers.
I agree with you Melissa, I am very new to this so I got a bit confused. But think once I learn more about this process revisiting the video will be much more helpful.
I like ANOVA, even though I don't know exactly what it is, because it gets rid of things that are necessarily vital to the results I want to get, It doesn't skew the results, to my understanding, but it does give you the significant results so that we know what we are looking at and know what our results mean to our hypothesis. I need some more clarity of what ANOVA really is and all it does, but I realize that it is a very important tool that is invaluable to researchers. Is ANOVA just the name of the test to show statistical significance? Or is it some sort of data point acronym? I guess I just want the basics of what it is to understand it better.
ANOVA and Post Hoc are new to me. It would have been helpful to learn more about this in class first and then perhaps watched the video. It was difficult for me to understand -- perhaps because it was a lot of information at once.
This is also very new to me, and I agree that it would have been helpful to discuss it in class first. Everything was difficult for me to understand, except the line chart labeled "mean of post test" to understand the different scores. I thought the second method of steps to follow in order to interpret the Anova and Post Hoc results were quicker and easier to follow.
Prof. at one place you have said that for equal no. of people we should use Tukey. I have unequal no. of people in my research, so which test to use? Thanks.
Could you explain about the overlap of confidence intervals? If I am not mistaken, the difference between the control and the existential groups are not valid since their confidence intervals overlap as seen in the descriptives section. Is that right?
Can two or more independent categorical and/or ordinal variables each having more than two labels (say 3 or 4....) be tested with one dependent scale variable by SPSS?
what if you have 80 patients divided in 3 groups: 20 controll, 30 group1, 30 group2, which posthoc test should one use....does the lower control group affect the selecetion of post hoc test
I have a question: I used one-way ANOVA to test one of my demographic which is marital status and the dependent variable is workplace bullying. I got one group (married-divorced) that have a sig difference after looking at post hoc but I dont know how to interpret it. should I say there is a significant difference between married and divorced people who are exposed to workplace bullying? then when I go back to the descriptive table to see the mean I only look for these two categories or all the groups?
This may work on my data. I am struggling trying to figure out what test I would use to interpret the data I would be collecting. I am comparing to groups using the Quality of Life scale, which measures compassion satisfaction, compassion fatigue, and burnout. I would like to see if there is a statistical difference between the two groups.The scale states you could use an ANOVA or t test.
Nice I like ANOVA because, you can compare more than two mean using Turkey's HSD, but to differentiate one mean from other people use superscript like a,b,c etc . whould you explain this?
Hi, I observed that in natural sciences some people perform Anova and Tukey tests with a very small sample sizes (7 to 15 per group) how to justify that? I’m a researcher in Management and social science and in my field, sample size should be at least 30 per group! Otherwise, small sample size violate the assumptions of using Anova (normality)! It’s rather T tests that should be used.. no?
Sometimes we want to look at more than two groups of data and compare them. The one way ANOVA does that for us. I guess Post Hoc test explore additional differences among means.
Hi Doc Thank you for this video. I want your opinion if you could help me please. I have 10 variables and I need to check the interaction between them. each variable has around ten (x and y) points. I tried the scatter chart and best fit line but R is so low. that is why I need to find another way to check the interaction. do you have any suggestions ? thanks in advance
hi sir, I was testing some financial data using Kruskal Wallis H Test. The test result says its significant but I am getting H statistic/ Chi sque value very very large compared with the others studies in the same field. Did i do something wrong, m i on right track. plz suggest me ???
Sir i ve a query Suppose I am comparing scores of three independent groups say X Y Z on a particular variable. Suppose before running ANOVA i want to check normality of my sample. If i ve to check normality of scores in each group separately or all together?? Secondly, if i checked normality of each group separetly, and suppose i found that scores of one group is not normaly distributed but other two had or vice versa.. how shud I proceed in this case?
Way over my head so far... These are becoming somewhat clearer, but there are a lot of terms used on her that make this difficult to follow. I think I got lost right around 1:05 lol. Hopefully things start to clear up after the other videos.
hi. thank you for the video :) may I know how to change the confidence interval when testing the anova? we can just change the sig level for post hoc in post hoc window... but what about the anova?
I am a student with Disabiites. I need help Can you help me? I have questions about options within the Anova test, T Test , and a few other things. . Statistics is my last course before I graduate From An american university. Do you have time to answer some questions. Iive in the Middle East,. I am orig from Oregon.
Sir my data size is under the thirty and likert scale data one to five.i collect this data for four type of people how to analyse my data.i use anvoa or other??
Danielle Maldonado I feel the same way! I think I will need to watch this video again and maybe take notes this time around. I understand the basics but some things went over my head.
hey i have a problem when trying to do a one way anova ,my factor variable is not available to use in the dialog box,only numeric variables appear,does anyone have a solution for this
Hello I am a bit Confused. I see you have Letters in your Data List under Groups(Control, CBT, and Existential) . What did you select in the Variable tab to allow letters to be typed. When I select String I am not able to run a post hoc on the data the variable is not in the box for the one way anova. Any help would be greatly appreciated
From the variable view (tab on the bottom left) go to "Values." Click on the cell corresponding to the variable being edited and then click the ellipsis in the right side of the cell. This dialog (Value Labels) will allow the association of string labels with numeric values.
Brittany Vodzak Agreed. SPSS seems more straightforward but maybe it's just because it is more aesthetically pleasing than Excel. I'm still trying to figure all of this out. Not comfortable with how to explain ANOVA... I can memorize these things but am having a hard time absorbing these concepts.
