Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: Re: nl error

From   "Michael Blasnik" <>
To   <>
Subject   st: Re: nl error
Date   Tue, 11 Oct 2005 11:29:47 -0400

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

----- Original Message ----- From: <>
To: <>
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
replace `1' = $b0 + $b1*triwk + $b2*(max(triwk-$k1,0))

nl spline crh

When I run the code I get the error:

variable ? not found
nlsplinec refused query, rc=111
Thank you for your help.

*   For searches and help try:

© Copyright 1996–2017 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index