Cox proportional analyses with panel data

[Bode Olufajo]

Hello All,

I am doing some survival analyses with data collected in panel form and I think I am not getting something right because it keeps telling me the "varlist is not allowed".

I am starting with the basics of -sts graph- after setting the data (stset gap failure(dx)).

Data looks like this:
id no state gap dx
1 1 1 0 0
1 2 1 20 1
2 1 0 0 0
2 2 0 5 0
3 1 1 0 0
3 2 1 5 0
3 3 1 15 1
3 4 1 20 1
3 5 1 26 1
4 1 0 0 0

Four patients have a sequence of events(follow up periods). At each visit they may either have "dx" or not. 'Dx" is the failure event and they should get censored once "dx"==1. "Gap" is the time variable. "state" is the patient group.

I plugged in sts graph by (state) after setting the data as above. No luck.

Does anybody know where I am going wrong?

Thanks.

[Clyde Schechter]

Two problems with your syntax: you need a comma before the -by- option, and you can't have a blank between the by and the left parenthesis.

sts graph, by(state)

[Bode Olufajo]

Oh my! I thought it was something more. Thank you Clyde.

[Paul T Seed]

There is also a comma missing in your -stset- command. It should be

stset gap, failure(dx)

These little things just have to be right when you are programming.

[Bode Olufajo]

Thank you Paul.