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Re: st: Loop-within-loop error while looping over observations for a microsimulation

From   Stephen Cranney <>
Subject   Re: st: Loop-within-loop error while looping over observations for a microsimulation
Date   Mon, 6 Aug 2012 08:50:23 -0600

monthsofpostpartum was a variable for how many months of infertility
are expected because of a birth.Therefore, the forvalues j=
0/monthsofpostpartum is attempting to capture the month/year sequences
that come after childbirth up to monthsofpostpartum

I wasn't aware that forvalues had that restriction. I'll change that
to an inputted macro elsewhere. However, when I change the
monthsofpostpartum variable to a constant (in this case 12), it's
giving me a "weights not allowed" sign.

On Mon, Aug 6, 2012 at 8:35 AM, Nick Cox <> wrote:
> What is -monthsofpostpartum-? -foreach- and -forvalues- won't evaluate
> for you what is not evaluated otherwise. Here -monthsofpostpartum-
> needs to be replaced by some constant.
> Nick
> On Mon, Aug 6, 2012 at 3:29 PM, Stephen Cranney
> <> wrote:
>> I'm trying to write a program that involves population microsimulation.
>> Each individual has a column for year and month, and the data is sorted
>> accordingly. I'm trying to loop through the observations with a stochastic
>> binomial function to simulate a birth occurring, but am then trying to
>> simulate the months of postpartum infertility so that it doesn't have the
>> individual getting pregnant twice in two months. Postpartum infertility is
>> indicated by .i and all of the fertile-time data is automatically indicated
>> by .f My syntax is below, but I keep getting an invalid syntax error and
>> can't figure out what I'm doing wrong.
>> Thanks in advance,
>> local N = _N
>> forvalues i = 1/`N' {
>>     forvalues j= 0/monthsofpostpartum {
>>         replace childbirth= rbinomial(1, probabilityconceive) if childbirth== .f
>>         replace childbirth[_n+j]== .i if childbirth [`i'] == 1
>>         }
>>     }
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