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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 14:31:09 +0100 |

That need not be any problem. If the variable already exists, just -drop- it first. Nick njcoxstata@gmail.com On 1 May 2013 14:06, Francesca Colantuoni <f.colantuoni9@gmail.com> wrote: > Oh OK. So, that's not the way to go. > Thanks a lot Nick, > Francesca > > On Tue, Apr 30, 2013 at 7:28 PM, Nick Cox <njcoxstata@gmail.com> wrote: >> -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/ > * > * 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**:**Re: st: how to program an equivalent of "egen mean" for an equation***From:*Francesca Colantuoni <f.colantuoni9@gmail.com>

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