Re: st: St: I am using a model with interactions. How can I obtain marginaleffects

[=?gb2312?B?0+Ag0evR6w==?= <yuyangyangkitty@hotmail.com>]

again,the code is following:
local xb  _b[pcinc]*`meanpcinc' + _b[ratio1]*`meanratio1' 
+_b[ii1]*`meanpcinc'*`meanratio1' + _b[_cons]-. 
predictnl dydt=  normalden(`xb')*(_b[pcinc]+_b[ii1]*`meanratio1')in 
1,se(sep)
but the result is also "invalid syntax". i think whether i make mistake in 
the last line?


> From: Maarten buis <maartenbuis@yahoo.co.uk>
> Reply-To: statalist@hsphsun2.harvard.edu
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: St: I am using a model with interactions. How can I 
obtain marginal effects 
> Date: Sat, 11 Feb 2006 17:48:35 +0000 (GMT)
>
> Hello:
>
> The problem is in the line: -local xb  _b[pcinc]*`meanpcinc 
'+_b[ratio1]*`meanratio1 '+_b[ii1]
> *`meanpcinc '*`meanratio1 '+_b[_cons]-. You call macros names `meanpcinc ' 
and `meanratio1 ' with
> a space. However you made the macros `meanpcinc' and `meanratio1', without 
space. So you called
> macros that do not exist, so they return a missing value, and that causes 
the syntax error. so
> that line should read: -local xb  _b[pcinc]*`meanpcinc' + 
_b[ratio1]*`meanratio1' +
> _b[ii1]*`meanpcinc'*`meanratio1' + _b[_cons]-. Note that the "-" at the 
begining and the end just
> mean by Statalist convention "type in Stata whatever is in between".
>
> HTH,
> Maarten
>
> --- �� ���� <yuyangyangkitty@hotmail.com> wrote:
> >    According to the
> > http://www.stata.com/support/faqs/stat/mfx_interact.html,the author 
tells
> > me how to obtain marginal effects and their standard errors. So I 
program,
> > the code is following:
> >  (Note:  h is the dependent variable ,  pcinc  ratio1 ii1 is the
> > independent                variable ,furthermore , ii1 is the 
interaction
> > term.)
> >  probit h  pcinc ratio1 ii1
> >  quietly summarize  pcinc if  e(sample)
> >  local meanpcinc = r(mean)
> >  quietly summarize ratio1 if e(sample)
> >  local meanratio1= r(mean)
> >  local xb  _b[pcinc]*`meanpcinc '+_b[ratio1]*`meanratio1 '+_b[ii1]
> > *`meanpcinc '*`meanratio1 '+_b[_cons]
> >
> > (The above step is ok in stata)
> >
> > predictnl dydt=  normalden(`xb')*(_b[pcinc]+_b[ii1]*`meanratio1')in 1
> > ,se(sep)
> >
> >  ��invalid syntax�� appears in stata. I don��t know what��s wrong with 
this
> > step .so could you help me to solve this problem.
>
> -----------------------------------------
> between 1/2/2006 and 31/3/2006 I will be
> visiting the UCLA, during this time the
> best way to reach me is by email
>
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting adress:
> Buitenveldertselaan 3 (Metropolitan), room Z214
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
>
>
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