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


From   Francesca Colantuoni <f.colantuoni9@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: how to program an equivalent of "egen mean" for an equation
Date   Tue, 30 Apr 2013 17:59:40 -0400

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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