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Re: st: how to program an equivalent of "egen mean" for an equation


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: how to program an equivalent of "egen mean" for an equation
Date   Wed, 1 May 2013 00:28:44 +0100

-egen- does not allow a -replace- option.
Nick
njcoxstata@gmail.com


On 30 April 2013 22:59, Francesca Colantuoni <f.colantuoni9@gmail.com> wrote:
> Thank you so much Nick! By placing a space between -egen- and `y' it
> does not give me that error. It gives me other errors
>  (specifically: "option replace not allowed nlh_n6 refused query,
> rc=198"), but I'll keep on working.
> Francesca
>
>
> On Tue, Apr 30, 2013 at 9:41 AM, Nick Cox <njcoxstata@gmail.com> wrote:
>> The specific error here is that you need a space between -egen- and
>> `y'. Stata is thinking that you are referring to a program or command
>>
>> egen__00000F
>>
>> and naturally it doesn't exist.   (Temporary variable names created by
>> Stata are all 8 characters long and begin with a double underscore.)
>>
>> I haven't look at the rest of your code.
>>
>> Nick
>> njcoxstata@gmail.com
>>
>>
>> On 30 April 2013 14:15, Francesca Colantuoni <f.colantuoni9@gmail.com> wrote:
>>> I am trying to program a non linear least square function using panel
>>> data. I have to create a sort of "within estimator" by having the
>>> estimation routine compute the average of the function for each value
>>> of the parameters, and such average needs to be plugged back in the
>>> original function in the following fashion: x_st-(mean)x_st=f(beta,
>>> gamma) - value_f((mean)beta,(mean)gamma)
>>> where s=market, t=time.
>>> While x_st-(mean)x_st is observed and I can compute it, I don't know
>>> how to implement the mean of the function in the routine, because I
>>> need to compute it for each estimated value of the parameters, but
>>> also for each individual (market) of the dataset, over time. I have
>>> tried this way, but obviously it does not work:
>>>
>>> program nlfrncs
>>> version 12.1
>>>
>>> if "`1'" == "?" {
>>> global S_1 "w b_ns b_s g2_ns g2_s g3_ns g3_s"
>>> global w=0
>>> global b_ns=-1
>>> global b_s=-2
>>> global g2_ns=0.5
>>> global g2_s=0.5
>>> global g3_ns=0.5
>>> global g3_s=0.5
>>>
>>> tempvar Y
>>> quietly {
>>> by market, sort:
>>> egen`Y'=mean(ln($w*exp($b_ns*price1+$g2_ns*price2+$g3_ns*price3)+(1-$w)*(y*exp($b_s*price1+$g2_s*price2+$g3_s*price3)+i*exp($b_s*price1+$g2_s*f_price2+$g3_s*f_price3))))
>>> , replace
>>> }
>>> exit
>>>
>>> }
>>> replace `1'=ln($w*exp($b_ns*price1+$g2_ns*price2+$g3_ns*price3)+(1-$w)*(y*exp($b_s*price1+$g2_s*price2+$g3_s*price3)+i*exp($b_s*price1+$g2_s*f_price2+$g3_s*f_price3)))-`Y'
>>> end
>>>
>>> I get the error: unrecognized command: egen__00000F
>>> Any suggestion or direction will be greatly appreciated.
>>> Francesca
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