st: set obs by level (of multiple variables)?

[Tim Evans <Tim.Evans@wmciu.nhs.uk>]

Hi all,

I'm trying to insert extra observations in my dataset - I've calculated survival and wish to graph the results but the data start from less than 100%, but I'd like the graph to graph from time 0 and thus 100%. My dataset is split by gender and stage so I need something that inserts an observation for say males & stage 1, males stage 2, females stage 1 and females stage 2.

Unfortunately, while this will provide me with an observation

set obs `=_N+1' it does not support this:

bysort stage sex: set obs `=_N+1'

Does anyone have an idea how I might do this in Stata 11.2?

Best wishes

Tim



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