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Re: PROC GLM repeated measures (one class, two models)

madpumpkinpie — Sun, 04 Feb 2018 23:09:29 GMT

proc glm;
     classes group;
     model Y1-Y12=group / nouni;
     repeated trt 3, time 4;
 run;

Hi again,

For the second question(https://communities.sas.com/t5/SAS-Statistical-Procedures/Two-within-subject-factors-repeated-measures-ANOVA/m-p/433997#M22850), there is no factor that is analogous to "group" (between subject factor). There are just two within-subject factors. How should I modify this code?

Re: PROC GLM repeated measures (one class, two models)

madpumpkinpie — Sun, 04 Feb 2018 20:02:24 GMT

Thank you for responding!!

I just posted another question (https://communities.sas.com/t5/SAS-Statistical-Procedures/Two-within-subject-factors-repeated-measures-ANOVA/m-p/433997#M22850) but your code may work for it.

What does "group" means? Does it from the data?

Re: PROC GLM repeated measures (one class, two models)

madpumpkinpie — Sun, 04 Feb 2018 19:55:05 GMT

It's randomized cross-over design, so the order of treatment is different between each subject. As there was no effect of session order on food intake (kcal), I did not consider it in this analysis.

Thank you for many resources, I get a bit confused but will refer to them!

Two within subject factors, repeated measures ANOVA

madpumpkinpie — Sun, 04 Feb 2018 19:40:33 GMT

Hello,

I am stuck to conduct two-way repeated measures ANOVA with two within-subject factors (Treatment and Time).

This data is just an example, but in this study 5 subjects join a study session three times. In each session, they are assigned one of the three kinds of test food (treatment) and their appetite is measured at 0, 15 and 30 minute points after the test food consumption.

Please find the excel file attached.

I would like to examine the treatment effect, time effect and interaction effect on appetite score, as well as at which time point the appetite score significantly differs between treatments (if there is a significant effect of treatment).

It would be really helpful if you could provide me with code that I can examine these. I want to know the code for normal (?) proc GLM procedure with two within subject factors, but also want to compare the result with that of proc MIXED repeated growth curve model (considering Time as continuous variable).

Thank you in advance,

Re: PROC GLM repeated measures (one class, two models)

madpumpkinpie — Sat, 03 Feb 2018 23:27:49 GMT

Thanks for responding,

Yeah I noticed the same thing, I just forgot to delete extra data (gender column had 82 extra rows).

The number of participants is 41 and all three treatments were assigned to each of them.

Re: How to conduct repeated measures ANOVA?

madpumpkinpie — Sat, 03 Feb 2018 15:23:10 GMT

Thank you for the very detailed exploration!!

However, it does not allow me to add more than one dependent variable (MANOVA).

Variables:

ID Gender(1or2) Treatment (1, 2, 3) EI WI

*EI energy intake (kcal), WI water intake (g)

I would like to examine the effect of two variables (treatment; within subjects, gender; between subjects) on each of two dependent variables (EI kcal and WI). I want to put the two dependent variables in the same analysis as there is a significant correlation between them.

I posted a question about this but it has not been solved yet.

https://communities.sas.com/t5/SAS-Statistical-Procedures/PROC-GLM-repeated-measures-one-class-two-models/m-p/433653#M22817

Could you tell me how I can conduct this analysis using the task (or code)?

Thank you,

PROC GLM repeated measures (one class, two models)

madpumpkinpie — Fri, 02 Feb 2018 18:33:50 GMT

HI there,

I want to conduct a repeated measures MANOVA to examine the effect of treatment (and gender as between subject factor) on Energy Intake (EI) and Water Intake (WI). I am putting these two dependent variables in the same analysis as there is a weak correlation between them.

There are three kinds of treatment and I am looking at the effect of those treatments on each group (EIkcal 1-3 and WI 1-3).

However, SAS interprets that there are six kinds of treatment (please refer to the attachment).

Please tell me how I can modify the code below! TIA

Variables: ID gender Eikcal1 EIkcal2 EIkcal3 WI1 WI2 WI3 ...

Code:
proc glm data=IMPORT2;
class gender;
model EIkcal1-EIkcal3 WI1-WI3 = gender / nouni;
repeated Treatment / printe;
run;

Re: How to conduct repeated measures ANOVA?

madpumpkinpie — Fri, 02 Feb 2018 18:13:09 GMT

Thank you

Re: How to conduct repeated measures ANOVA?

madpumpkinpie — Wed, 31 Jan 2018 14:40:17 GMT

Thank you for replying,

Could you tell me where exactly I can find them? Please find the attachments... I tried to do my best, but sorry if you find them too rough to see

Also I appreciate if you can tell me the difference like when to use which model.

Thank you! Picture1Cont'd

How to conduct repeated measures ANOVA?

madpumpkinpie — Sat, 27 Jan 2018 16:36:54 GMT

Hi there,

I am a beginner of SAS and only using "Auto-complete" function (choosing what to do from options in Task tub).

I wanted to conduct one-way repeated measures ANOVA but cannot find the option. I can find one-way ANOVA though.

I heard, in SPSS, they automatically choose the most suitable test when we choose repeated ANOVA option.

In SAS, do we have to choose the appropriate test for repeated measures by ourselves? If so, could you tell me the name of those tests?

Thank you,

Re: How to "Split Data" (By Group Processing)

madpumpkinpie — Sat, 27 Jan 2018 15:32:58 GMT

Hi there,

I'm sorry, but I don't get why no need of split...:( Could you explain?

Then if I want to see the separate result of the effect of treatment on calorie intake for different weight status, may I conduct one-way ANOVA twice (one for NW group and the other one for OW group)?

Thanks,

Re: How to "Split Data" (By Group Processing)

madpumpkinpie — Fri, 26 Jan 2018 22:56:17 GMT

Thank you for replying!

Does this code include both the command for splitting file and running ANOVA?

Re: How to "Split Data" (By Group Processing)

madpumpkinpie — Fri, 26 Jan 2018 22:52:51 GMT

Thank you for replying!

I understand what you mean, but then how can I compare the effect of treatment on food intake between NW and OW participants? It's because I found significant treatment effect in NW group (n=41) but not in OW group (n=12) when I ran One-way repeated measures ANOVA for each body weight group.

And what is this code for? Where to be put?

proc glm;
    class weight treatment;
    model kcal=weight|treatment;
run;
quit;

Thank you,

How to "Split Data" (By Group Processing)

madpumpkinpie — Fri, 26 Jan 2018 20:15:34 GMT

Hi there,

I have googled similar questions but could not find answers that I can understand. So here I am asking for your help!

What I want to know is how to get results separately in a group.

Example (just copied and pasted from Excel)

ID Weight Treatment kcal
1   NW   A   400
2   NW   A   500
3   OW   A   560
4   NW   A   800
5   OW   A   490
6   NW   A   500
7   OW   A   400
8   OW   A   700
9   NW   A   900
1   NW   B   580
2   NW   B   600
3   OW   B   800
4   NW   B   500
5   OW   B   600
6   NW   B   800
7   OW   B   700
8   OW   B   500
9   NW   B   780
1   NW   C   570
2   NW   C   670
3   OW   C   570
4   NW   C   400
5   OW   C   600
6   NW   C   800
7   OW   C   800
8   OW   C   500
9   NW   C   800

In this example, I am going to run one-way repeated measures ANOVA to see if there is a treatment effect (A, B, C) on subsequent calorie intake (kcal). However, I want to see the result separately for each body weight status (NW=normal weight & OW=overweight). Please ignore the small sample size because this is just an example.

In SPSS, we can "split file" and then get results for both NW and OW separately in any analysis conducted after that.

I am an absolute beginner of SAS and have never edited the code. Just importing excel files for each analysis and selecting some commands. Therefore, I'd appreciate if you could explain in a comprehensive way if it involves code!

TIA