Maximum Cluster Size in proc genmod

[CathyVI]

Hi,

I am new to pro genmod. I ran a model expecting to get a Maximum Cluster Size =12, and Minimum Cluster Size=12 but I am getting a maximum cluster of 24. How do I get a maximum cluster of 12. My data is a repeated data where each unique id has 12 rows. 

I have provided a sample here. 

bene_id   Month_std

A              -12

A              -11

A              -10

A              -9

A              -8

A              -7

A              -6

A              -5

A              -4

A              -3

A              -2

A              -1

[StatDave · Accepted solution]

Check your data. If all of your BENE_ID values are not unique, then you might have one or more values that have two sets of 12 observations associated with one BENE_ID value. You could use something like the following to see the number of observations in each BENE_ID value: proc means; class bene_id; var month_std; run;