From: Allin Cottrell <cottrell@wfu.edu>
To: Gretl list <gretl-users@lists.wfu.edu>
Sent: Sunday, 28 October 2012, 23:21
Subject: Re: [Gretl-users] Principal Components Analysis Misbehavior
On Sun, 28 Oct 2012, Henrique Andrade wrote:
> Em 26 de outubro de 2012, Allin Cottrell escreveu:
>
> On Fri, 26 Oct 2012, Henrique Andrade wrote:
>>
>>> I found another little strange behavior using PCA
>>> Function. Please take a look at the following Hansl
>>> code:
>>>
>>> <hansl>
>>> open australia.gdt
>>>
>>> loop i=1..30 --quiet
>>> pca PAU PUS E --save[1]
>>>
endloop
>>> </hansl>
>>>
>>> After 27 repetitions, the loop starts to save all the
>>> new series with the same name "PC1z".
>>
>> Well, yes, gretl will only go so far in trying to give unique names
>> to the components. For more control over the process, use the
>> function form, princomp().
>
> Dear Allin, is this the expected behavior? In the example
> above Gretl is saving different series with the same name.
Oops, no, that is not intended. I thought you meant that the series
PC1z was getting over-written, which wouldn't be so bad. Anyway,
this should now be fixed in CVS: we now allow for three rounds of
the alphabet, not just one: from "PC1" to "PC1zzz" or over 17000
series.
Allin
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