Calculating T-Test Sample Sizes (with G*Power) | Statistics

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Design eLearning Tutorials

Design eLearning Tutorials

Күн бұрын

Пікірлер: 44
@peterdelaney2593
@peterdelaney2593 4 жыл бұрын
Shared this with my lab group today after I covered the same material in about 4 minutes at the end of a long lab meeting. I think they may prefer yours.
@DesigneLearningTutorials
@DesigneLearningTutorials 4 жыл бұрын
Let me know if I can create any more content for you! Subscribe to check out my latest series on usabiliy evaluation, including Stats made easy!
@SamuelAlamo
@SamuelAlamo 4 жыл бұрын
What a great video mate... So well explained, calmed, with examples... Best out there in Sample Sizes hands down. Love from spain!
@DesigneLearningTutorials
@DesigneLearningTutorials 4 жыл бұрын
Much appreciated!
@Daveaaaaa
@Daveaaaaa 4 жыл бұрын
I didn't think you could make statistics easy to understand for someone who failed their Maths GCSE, but you managed it! :)
@DesigneLearningTutorials
@DesigneLearningTutorials 4 жыл бұрын
Don't worry, I ran away from Maths A-Level to do Theatre!
@Dani3pez
@Dani3pez 2 жыл бұрын
This was extremely helpful! Thanks!
@DesigneLearningTutorials
@DesigneLearningTutorials 2 жыл бұрын
You are extremely welcome Sir
@florence7091
@florence7091 6 жыл бұрын
Really helpful video, thank you!
@jasonmiller6381
@jasonmiller6381 2 жыл бұрын
Thank you so much for your tutorial. I learned a lot. I have a question for you, if t-test is the best or another option. Is it best to write here, or a diffrent communication channel?
@DesigneLearningTutorials
@DesigneLearningTutorials 2 жыл бұрын
Hi Jason! I’m so happy to help you. If you have a question, just write it here. I may may a video answer, so please subscribe to stay up to date with all new content
@jasonmiller6381
@jasonmiller6381 2 жыл бұрын
@@DesigneLearningTutorials I have subcribed, your videos are very helpful. I have a study with 4 covariates as I was told pre-post test adds a lot of confounding variablbes. Do you have a video on IV and DV? - simplified? My study has 2 groups, 3 surverys, a prompt, then intervention and follow up with a prompt and 3 surveys. I am either doing a T-Test (Difference between two independent means (two groups) or F-Test (Ancova), unless you suggest a different test.
@mazinalwish9506
@mazinalwish9506 Жыл бұрын
thank you so much
@chaozhao6012
@chaozhao6012 4 жыл бұрын
Soooo helpful video. Looking forward to more stuff like this.
@DesigneLearningTutorials
@DesigneLearningTutorials 4 жыл бұрын
More to come!
@polohou8919
@polohou8919 5 жыл бұрын
Very helpful, thank you
@gaynorayin5999
@gaynorayin5999 3 жыл бұрын
Excellent video thank you so much!
@DesigneLearningTutorials
@DesigneLearningTutorials 3 жыл бұрын
Glad you enjoyed it!
@mukeshmaharjan9449
@mukeshmaharjan9449 4 жыл бұрын
It was a really helpful video... thank you very much !!!
@DesigneLearningTutorials
@DesigneLearningTutorials 4 жыл бұрын
Glad it was helpful!
@6xn5
@6xn5 4 жыл бұрын
Thank you.
@snigdhodas2848
@snigdhodas2848 2 жыл бұрын
what if i take the effect size based on a previous research and get an effect size as high as 2 or 3,should I transfer the same to the main window or take a lower effect size?
@DesigneLearningTutorials
@DesigneLearningTutorials 2 жыл бұрын
Are you trying to calculate the sample size for a study based on the effect size of previous research?
@snigdhodas2848
@snigdhodas2848 2 жыл бұрын
@@DesigneLearningTutorials yes Sir
@izzatulyusuf5605
@izzatulyusuf5605 3 жыл бұрын
Thank you so much for this! It was really helpful. However, Im still unclear with the ratio part, what if e.g im conducting a study to compare individuals from a single parent family and individuals from dual parents families, would this be considered as 2 different people?
@DesigneLearningTutorials
@DesigneLearningTutorials 3 жыл бұрын
Yes. You have two different groups. One person can only be in one group. 100 People from a two parent family and 50 people from a single parent family is 2:1 ratio (0.5). I’m glad I helped you in your journey. Please like and subscribe to help other people find this video too!
@izzatulyusuf5605
@izzatulyusuf5605 3 жыл бұрын
@@DesigneLearningTutorials I see, thank you! So i would put in 2 as the allocation ratio? How do I determine which sample size is for which group tho. Like i would get 38 sample size for group 1 , and 76 sample size for group 2. Which one is which?
@DesigneLearningTutorials
@DesigneLearningTutorials 3 жыл бұрын
@@izzatulyusuf5605 Hi, without knowing more about your data or what you have run it is hard to say, but it sounds like 76 + 38 = 114
@lolololeta1370
@lolololeta1370 4 жыл бұрын
Hi.i have study of effect of phototherapy on serum calcium in neonates.i have one group .and previous study measured serum calcium before +_sd .and serum calcium after phototherapy +_sd.how can i calculate sample size
@DesigneLearningTutorials
@DesigneLearningTutorials 4 жыл бұрын
You need a paired samples t-test. Would you like a video on this?
@waynewu7763
@waynewu7763 3 жыл бұрын
i have a different result when calculate power using norminv and normdist in Excel. I think its because i am assuming normal distribution. As I increase the sample size, I can see the distribution getting narrower. but i dont see that with GPower. I can see that GPower assumes T-distribution, but how is it determining the distribution without factoring standard deviation? Could you explain the math behind getting the beta value?
@DesigneLearningTutorials
@DesigneLearningTutorials 3 жыл бұрын
Great question Wayne. Unfortunately I don’t know G*Power’s internal calculations, but maybe there developers can help you? www.psychologie.hhu.de/arbeitsgruppen/allgemeine-psychologie-und-arbeitspsychologie/gpower
@waynewu7763
@waynewu7763 3 жыл бұрын
@@DesigneLearningTutorials thank you!
@DesigneLearningTutorials
@DesigneLearningTutorials 3 жыл бұрын
@@waynewu7763 I'm happy to have helped. Please like and subscribe to help others find this video
@dr.raghadraad4403
@dr.raghadraad4403 3 жыл бұрын
Hi, l'm study two groups first group drug abused second group health people and importance point that sample size for drug abuser is very limited in my country nearly 193 can you help my for calculated sample size and my objectives in my study 5 object how can calculated sample size for each objective ?
@dr.raghadraad4403
@dr.raghadraad4403 3 жыл бұрын
Hi, l'm study two groups first group drug abused second group health people and importance point that sample size for drug abuser is very limited in my country nearly 193 can you help my for calculated sample size and my objectives in my study 5 object how can calculated sample size for each objective ?
@DesigneLearningTutorials
@DesigneLearningTutorials 3 жыл бұрын
Let’s solve this. Do you need to compare two groups for each of the five objectives?
@amsaran
@amsaran 6 жыл бұрын
Can you please guide me if I want to use G-Power to calculate sample size (participant is drink escort)? I did find previous research which I could get around 3,200 samples have been done in the research. I need to compare two group of participants (escorts will be divided into two group for RCT). Could you please guide how to use the G-Power to calculate my sample size. Thank you in advance. Regards
@DesigneLearningTutorials
@DesigneLearningTutorials 6 жыл бұрын
What test do you want to run? I imagine a t-test as in this video based on two groups?
@musinzi55
@musinzi55 4 жыл бұрын
Or eskimos walked by.. 😂. I gotchu right away!!!
@DesigneLearningTutorials
@DesigneLearningTutorials 3 жыл бұрын
My pleasure
@Chenxi-y1y
@Chenxi-y1y 4 жыл бұрын
Very helpful and easy to follow. Thank you ^_^
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