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The explanation may, in fact, have to do with version issues (as you suggested) as dot-operator notation (which is what breaks mca)
was added someplace along the way. Given "hdroo_1." was a legitimate matrix row name in v5.0 but is not in v8.2, suggests the
addition occurred after v5.0.

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 11:02 AM
> To: [email protected]
> Subject: st: AW: RE: Error in -mca- and -coranal- 
> (correspondence analysis)
> 
> 
> 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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