st: Re: nl error

["Michael Blasnik" <michael.blasnik@verizon.net>]

You seem to have an extra space in your line

if "`1' " == "?" {

the space appears after the closing single quote , you need to write "`1'", 
not "`1' ".  That typo means that the if statement will never be true and nl 
gives the appropriate error message about nlspline refusing the query.

Michael Blasnik
michael.blasnik@verizon.net

----- Original Message ----- 
From: <lm335@drexel.edu>
To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, October 11, 2005 11:18 AM
Subject: st: nl error



> Dear all,
>              I’ve been having trouble with the nl command in stata. I’m 
> trying to estimate the following function
>
> Crh= b0 + b1*triwk + b2*(max(triwk-k1,0))
>
> The code is given below
>
>
> gen  trisp1=max(triwk -14, 0)
> regress crh triwk trisp1
> global b0= _b[_cons]
> global b1= _b[triwk ]
> global b2= _b[trisp1]
>
> capture program drop nlspline
> program define nlspline
> version 8.2
> if "`1' " == "?" {
> global S_1 "b0 b1 b2 k1"
> global b0= $b0
> global b1= $b1
> global b2= $b2
> global k1=14
> exit
> }
> replace `1' = $b0 + $b1*triwk + $b2*(max(triwk-$k1,0))
> end
>
> nl spline crh
>
> When I run the code I get the error:
>
> variable ? not found
> nlsplinec refused query, rc=111
> <snip>
> Thank you for your help.
>
> Leny
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