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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 >>> * >>> * For searches and help try: >>> * http://www.stata.com/help.cgi?search >>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>> * http://www.ats.ucla.edu/stat/stata/ >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/faqs/resources/statalist-faq/ >> * http://www.ats.ucla.edu/stat/stata/ > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**References**:**st: how to program an equivalent of "egen mean" for an equation***From:*Francesca Colantuoni <f.colantuoni9@gmail.com>

**Re: st: how to program an equivalent of "egen mean" for an equation***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: how to program an equivalent of "egen mean" for an equation***From:*Francesca Colantuoni <f.colantuoni9@gmail.com>

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