Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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   Wed, 1 May 2013 09:06:35 -0400

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/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index