Programming the statistical procedures from SAS

Repeated measure data analysis/glm

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Repeated measure data analysis/glm


I have data obtained from 32 participants who had their plasma phenylalanine levels tested at different time points (15 times) over a 24 hour period. The participants were categorised into four different groups ( Group 1-intervention), Group 2-diet only), group 3-controls and Group 4.  I have tried PROC GLM but i had averaged the data for each participants ( i think this is wrong approach). I have never analysed repeated measure data before and i would like help. So my question is, what is the best method to analyse this data, what DATA step can i use or how do i input the data in DATA step? i am using SAS version 9.4.

I have attached Excel spreadsheet for raw data below. Thank you in advance.  

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