topic Re: SAS Studio repeated measures over time in Statistical Procedures

SAS Studio repeated measures over time

gteixeira — Wed, 17 Jun 2026 17:08:13 GMT

Hi everyone,

I am struggling with a SAS Studio code for a repeated measures analysis.

I measured the respiration rate of two potato cultivars in two different years stored at three temperatures. The potato samples were evaluated 9 times during the storage period.

Could you please help me with this code?

Thank you!

Re: SAS Studio repeated measures over time

Kurt_Bremser — Thu, 18 Jun 2026 09:36:12 GMT

Please show us an example of your input data (just enough observations to illustrate your case), and the expected result from it.

Re: SAS Studio repeated measures over time

gteixeira — Thu, 18 Jun 2026 13:11:11 GMT

Dear Kurt,

Thank you very much for your response.

I am glad to provide some input data. I want to see the effects of years (harvest seasons), cultivars, storage temperatures, over time (storage). For some variables, I commonly use a factorial design as they are destructive, but for others (weight loss, respiration), I use the same samples with repeated evaluations over time in storage.

Cheers

Re: SAS Studio repeated measures over time

jiltao — Thu, 18 Jun 2026 14:18:39 GMT

The data seems to me to lack a subject variable that identifies the experimental unit. If this is a repeated measures data, then what variable identifies the experimental unit that repeated measures were obtained? You might need to add that variable in the data set.

Thanks,

Jill

Re: SAS Studio repeated measures over time

gteixeira — Thu, 18 Jun 2026 14:26:49 GMT

Hi Jill,

Thank you for your response.

The respiration rate (Resp) was measured repeatedly by Days. Thus, Days are the designation for the repeated evaluations.

Thanks

Re: SAS Studio repeated measures over time

gteixeira — Mon, 22 Jun 2026 13:35:49 GMT

Hi everyone,

Any suggestions regarding this data?

Thank you!

Gustavo

Re: SAS Studio repeated measures over time

jiltao — Mon, 22 Jun 2026 14:55:42 GMT

You need a variable to identify the subjects. See this example SAS Help Center: Repeated Measures.

Person is the subject, it is the experimental unit of the repeated measures. What is the equivalent in your data?

Thanks,

Jill

Re: SAS Studio repeated measures over time

gteixeira — Mon, 22 Jun 2026 15:37:48 GMT

Hi,

The respiration (Resp) is the subject.

Thank you!

Re: SAS Studio repeated measures over time

jiltao — Mon, 22 Jun 2026 17:28:27 GMT

Resp is your response variable, not the subject variable, as far as I can tell.

Re: SAS Studio repeated measures over time

gteixeira — Mon, 22 Jun 2026 17:30:39 GMT

Respiration will vary according to the Year (Year), Cultivar (CV), Storage Temperature (Temp), and time in storage (repeated measures - Days.

Thank you!

Re: SAS Studio repeated measures over time

gteixeira — Mon, 22 Jun 2026 21:32:14 GMT

Hi,

I have another dataset in a different format.

Cheers