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st: RE: Conditional operatior trouble


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Conditional operatior trouble
Date   Mon, 15 Sep 2008 19:06:14 +0100

Apart from Maarten's pertinent comments, note that in Stata this could
be done like 
this, translating ? : to -cond(,)-  

gen week = 1 
gen dow = dow(stdate) 
replace week = cond(dow < dow[_n-1], week[_n-1] + 1, week[_n-1]) in 2/L 

Nick 
n.j.cox@durham.ac.uk 

Ashim Kapoor

I am having trouble with the last line of the following code  : -

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

gen week=1
gen dow=dow(stdate)

gen changeinweek=1 if dow< dow[_n-1]

replace week=( changeinweek==. ) ? week[_n-1] : week[_n-1]+1

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

It says " invalid  ? "

Could someone please tell me what I am doing wrong ? In case someone
needs details I am assigning weeks to my data.

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