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st: AW: RE: Error in -mca- and -coranal- (correspondence analysis)


From   "Christian Holz" <[email protected]>
To   <[email protected]>
Subject   st: AW: RE: Error in -mca- and -coranal- (correspondence analysis)
Date   Thu, 7 Jul 2005 16:02:05 +0100

Thanks Tom,
Of course it cannot cope with fractions. But as the author of the ado file
used this very example in the help file I did forget the 4th commandment of
applied econometrics "Thou shalt inspect thy data" (Kennedy 2003: 396) and
didn't check for that :)
Thanks a lot.

Christian Holz
Department of Sociology, Anthropology and Applied Social Sciences 
University of Glasgow Scotland, U.K.

-----Urspr´┐Żngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Steichen,
Thomas J.
Gesendet: 07 July 2005 15:29
An: [email protected]
Betreff: st: RE: Error in -mca- and -coranal- (correspondence analysis)

Christian --

-mca- cannot cope with the non-integer values of headroom.

Try  
.. gen hd = 10 * headroom 
.. mca foreign rep78 hd, d(3)

Tom

Thomas J. Steichen
[email protected]
----------------------------------------------------------------------------
  Facts do not cease to exist because they are ignored. - Aldous Huxley
----------------------------------------------------------------------------



> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of 
> Christian Holz
> Sent: Thursday, July 07, 2005 10:09 AM
> To: [email protected]
> Subject: st: Error in -mca- and -coranal- (correspondence analysis)
> 
> 
> Dear Stata-Listers,
> 
> I have to perform some correspondence analyses and did 
> therefore download the mca.ado and coranal.ado of Philippe 
> Van Kerm (University of Namur, BE) from stata.com. 
> Unfortunately both ados always produce an error r(198) 
> "operator invalid" after the output of the principal inertia 
> components. Obviously there is something wrong in the ado 
> file itself. Is it possible that I experience a version 
> incompatibility here (the ados were written for version 5 - 
> I, myself, use 8.2)? Did anyone experience the same problem 
> and found a solution/workaround? Here the example from the 
> help files for -mca- and the output I get:
> 
> . sysuse auto
> (1978 Automobile Data)
> 
> . mca foreign rep78 headroom, d(3)
> --------------------------------------------------------------
> --------------
> --
> 
>                    MULTIPLE CORRESPONDENCE ANALYSIS
> 
> --------------------------------------------------------------
> --------------
> --
> 
> 
>  Total Inertia :      0.431
> 
>  Principal Inertia Components :
> 
>       Inertia    Share    Cumul
> Dim1    0.308    0.713    0.713
> Dim2    0.060    0.138    0.851
> Dim3    0.039    0.090    0.941
> headr_1:  operator invalid
> r(198);
> 
> 
> Help is as always very much appreciated!
> Cheers,
> 
> Christian Holz
> Department of Sociology, Anthropology and Applied Social 
> Sciences University of Glasgow Scotland, U.K.
> 
> *
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> 

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