missing value handling & computational precision

• Next message: Schmidt, Susanne: "niche et OMI"
• Previous message: Gindo Tampubolon: "Specific Multiple correspondence analysis (with passive modalities)"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hello/Bonjour -

I have a question about ADE's handling of missing values in correlation
PCA. Are missing values deleted pairwise in computation of the
correlation matrix, or are means substituted? What is the default and
is there facility to change this? I haven't been able to find this
answer in the documentation pdfs, but perhaps I've not been looking in
the correct place.

Also, what is the computational precision of ADE-4 -- double precision
(64-bit, real*8) or long precision (128-bit, real*16)?

I'm trying to compare some PCA results to those obtained from SPSS.

regards,
Ian.

Ian D. Martin, Ph.D.
Aquatic Ecologist

• Next message: Schmidt, Susanne: "niche et OMI"
• Previous message: Gindo Tampubolon: "Specific Multiple correspondence analysis (with passive modalities)"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

This archive was generated by hypermail 2b30 : Tue Oct 18 2005 - 10:35:39 MEST