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From |
Nick Cox <n.j.cox@durham.ac.uk> |

To |
"'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: nl-function log4-formula |

Date |
Wed, 16 Nov 2011 10:36:08 +0000 |

I don't know, but tucking the -if- condition inside the parentheses looks a bit odd. Try moving it outside. -nl- is a command, not a function. Nick n.j.cox@durham.ac.uk Jennyfer Wolf I am working with the nl-function and with the logistic function model log 4. Could somebody please explain me why I do not get the same outout if I type: 1. nl log4: VAR1 VAR2 if VAR3=="xxx" and 2. nl(VAR1={b0}+{b1}/(1+exp(-{b2}*(VAR2-{b3}))) if VAR3=="xxx") Actually 1. should just be an abbreviation of 2.? If I run command 1, I get estimates for b0, b1, b2, b3, if I run command 2 I only get an estimate for b0 and b1-b3 are 0. Could somebody explain how to write the formula "in full" (like in 2.), to get the same results as in the first formula. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: RE: nl-function log4-formula***From:*Jennyfer Wolf <jennyfer.wolf@googlemail.com>

**References**:**st: nl-function log4-formula***From:*Jennyfer Wolf <jennyfer.wolf@googlemail.com>

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