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From |
"Brian P. Poi" <bpoi@stata.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: nonlinear least square |

Date |
Mon, 22 Aug 2005 10:47:10 -0500 (CDT) |

On Mon, 22 Aug 2005, clothilde dufort wrote:

I strongly suspect that Clothilde is using Stata 8 with an -nl- program written for Stata 9.hi, I am trying to estimate the follwing non linear equation : spe=alpha + beta*hpe^gamma so I use the function "nl" in stata and before I write the following program. --- program nlsal, rclass syntax varlist(min=2 max=2) [aw fw iw] if local lhs: word 1 of `varlist' local rhs: word 2 of `varlist' regress `lhs' `rhs' [`weight'`exp'] `if' tempname a b scalar `a' = _b[_cons] scalar `b' = _b[`rhs'] return local eq "`lhs' = {alpha=`=`a''}+{beta=`=`b''}*`rhs'^{gamma=1}" return local title "`lhs' = alpha+beta*`rhs'^gamma" end --- and then i write : nl sal: spe hpe but stata reply : : invalid name nlsal: refused query, rc=198

When I run her code using the auto dataset in Stata 9, I do not get an error message and -nl- goes through its iterations.

When I run her code using Stata 8, I get precisely the same error message that Clothilde reports.

The solution is to either use the existing program "nlsal" with Stata 9, or else rewrite it using the syntax required by Stata 8's version of -nl-.

Hope this helps

Brian Poi

bpoi@stata.com

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**Follow-Ups**:**Re: st: nonlinear least square***From:*"lapetitemoi93" <lapetitemoi93@yahoo.fr>

**References**:**st: nonlinear least square***From:*clothilde dufort <lapetitemoi93@yahoo.fr>

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