SAS Studio repeated measures over time

[gteixeira]

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!

[Kurt_Bremser]

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

[gteixeira]

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

[jiltao]

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

[gteixeira]

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

[gteixeira]

Hi everyone,

Any suggestions regarding this data?

Thank you!

Gustavo

[jiltao]

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

[gteixeira]

Hi,

The respiration (Resp) is the subject.

Thank you!

[jiltao]

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

[gteixeira]

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

Thank you!

[gteixeira]

Hi,

I have another dataset in a different format.

Cheers