RE: st: FORVAL loop incomplete

["Francis, Richard N" <rnfrancis@utep.edu>]

Hi Nick,

Bet you are right, I really appreciate your input and advice.

Work-around is the centerpiece of the program for sure.

Thanks again!

Rick Francis
Associate Professor
Department of Accounting
College of Business Administration
University of Texas at El Paso
500 W. University Avenue
El Paso, TX  79968
Office: 915-747-7953
FAX: 915-747-8618
Email:  rnfrancis@utep.edu


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Saturday, November 09, 2013 10:57 AM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: FORVAL loop incomplete

An earlier thread established that -sroot- (SJ) does not support -if- correctly. That's the entire point of the work-around being used here.
Nick
njcoxstata@gmail.com


On 9 November 2013 17:52, William Buchanan <william@williambuchanan.net> wrote:
> Hi Rick,
>
> I've adjusted some of your code below based on the information that you've provided to the listserv:
>
> destring gvkey, replace
>
> encode gvkey, gen(id)
>
> gen date = yq(year, fqtr)
>
> tsset id date, quarterly
>
> g Z14 = .
> g Z24 = .
> g Z34 = .
> g Z4t = .
> g Z3t = .
> g Z2t = .
> g Z1t = .
>
> su id, meanonly
>
> forval i = 1/3 {
>    sroot fcf if id==`i'
>         replace Z14 = r(Z14) if id== `i'
>         replace Z24 = r(Z24) if id== `i'
>         replace Z34 = r(Z34) if id== `i'
>         replace Z4t = r(Z4t) if id==`i'
>         replace Z3t = r(Z3t) if id==`i'
>         replace Z2t = r(Z2t) if id== `i'
>         replace Z1t = r(Z1t) if id== `i'
> }
>
> You could also take Sergiy's suggestion and store everything in matrices, and if you wanted you could easily modify the user-written program around line 306 to store all of the values in a matrix that you could return in the same way as the scalars that you are referencing here.  If you wanted to create a new dataset based on the results, you could possibly modify the program to make it byable and use -statsby-, or you could check out -post- and -postfile- commands to store the results to another file.
>
> HTH,
> Billy
> On Nov 9, 2013, at 10:41 AM, "Francis, Richard N" <rnfrancis@utep.edu> wrote:
>
>> Hi Sergiy,
>>
>> Thank you for taking time out of your day for such a novice issue.
>>
>> The entire pgm looks like this:
>>
>>
>> destring gvkey, replace
>>
>> egen id = group(gvkey), label
>>
>> gen date = yq(year, fqtr)
>>
>> tsset id date, quarterly
>>
>> su id, meanonly
>>
>> g Z14 = .
>> g Z24 = .
>> g Z34 = .
>> g Z4t = .
>> g Z3t = .
>> g Z2t = .
>> g Z1t = .
>>
>> forval i = 1/`r(max)' {
>>    preserve
>>    keep if id == `i'
>>    sroot fcf
>>       return list
>>       ereturn list
>>       replace Z14 = r(Z14) in `i'
>>       replace Z24 = r(Z24) in `i'
>>       replace Z34 = r(Z34) in `i'
>>       replace Z4t = r(Z4t) in `i'
>>       replace Z3t = r(Z3t) in `i'
>>       replace Z2t = r(Z2t) in `i'
>>       replace Z1t = r(Z1t) in `i'
>>       append using new
>>    restore
>> }
>>
>> R(max) immediately prior to the FORVAL loop is three (3), but I'm not sure this is what you are looking for in your first comment.
>>
>> Does this help at all?
>>
>> Again, thank you!
>>
>> Rick Francis
>>
>> -----Original Message-----
>> From: owner-statalist@hsphsun2.harvard.edu 
>> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Sergiy 
>> Radyakin
>> Sent: Saturday, November 09, 2013 9:28 AM
>> To: statalist@hsphsun2.harvard.edu
>> Subject: Re: st: FORVAL loop incomplete
>>
>> Rick,
>> 1) N may be 180, but what is r(max)? In Stata r(max) is the result of the previous command [of r-class]. You don't show us this command.
>> Please do.
>> 2) The combination of "append using new" and "restore" does not make sense, Whatever you append you immediately lose.
>> 3) If append is meant to add one observation where you are saving the 
>> results (dataset new is a blank one observation of the same layout as 
>> the current dataset), consider using: expand in _N
>> 4) If you want to accumulate the results of your tests, consider using a matrix to hold the results, and avoid modifying the data.
>> Best, Sergiy
>>
>> On Sat, Nov 9, 2013 at 8:14 AM, Francis, Richard N <rnfrancis@utep.edu> wrote:
>>> I'm sorry, N = 180 obs, currently cycles through the first 60 (3 groups of 60 =180 total obs).
>>>
>>> Thank you!!
>>>
>>> Rick Francis
>>>
>>> -----Original Message-----
>>> From: owner-statalist@hsphsun2.harvard.edu
>>> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
>>> Sent: Saturday, November 09, 2013 9:08 AM
>>> To: statalist@hsphsun2.harvard.edu
>>> Subject: Re: st: FORVAL loop incomplete
>>>
>>> Tell us what r(max) is.
>>> Nick
>>> njcoxstata@gmail.com
>>>
>>>
>>> On 9 November 2013 15:53, Francis, Richard N <rnfrancis@utep.edu> wrote:
>>>> Hello Statalist,
>>>>
>>>> Have a simple FORVAL loop which should result in multiple cycles.
>>>>
>>>> However, she only cycles once. I'm sure the answer is obvious to experienced Stata users (which I am not).
>>>>
>>>> The loop is as follows:
>>>>
>>>>
>>>> forval i = 1/`r(max)' {
>>>>    preserve
>>>>    keep if id == `i'
>>>>    sroot fcf
>>>>               return list
>>>>               ereturn list
>>>>               replace Z14 = r(Z14) in `i'
>>>>               replace Z24 = r(Z24) in `i'
>>>>               replace Z34 = r(Z34) in `i'
>>>>               replace Z4t = r(Z4t) in `i'
>>>>               replace Z3t = r(Z3t) in `i'
>>>>               replace Z2t = r(Z2t) in `i'
>>>>               replace Z1t = r(Z1t) in `i'
>>>>               append using new
>>>>    restore
>>>> }
>>>>
>>>> I am grateful for any thoughts anyone may have.
>>>>
>>>> Thank you!!
>>>>
>>>> Rick Francis
>>>>
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