[Pspp-commits] [SCM] GNU PSPP branch, covariance, updated. v0.6.1-860-g3bbe45f

[John Darrington]

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The branch, covariance has been updated
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      from  09e9433298a484353b1aac68018871553bee3d55 (commit)

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- Log -----------------------------------------------------------------
commit 3bbe45fcc70f8d059b4bf6715d629209b50fa48e
Author: John Darrington <address@hidden>
Date:   Sat Oct 17 11:12:56 2009 +0200

    Add a two pass algorithm to calculate covariance matrices.
    
    The single pass algorithm, although faster, is numerically unstable.
    Furthermore, at can't reasonably be achieved when categorical variables
    are involved.    This change implements a two pass algorithm and allows
    the caller to choose which algorithm (s)he prefers.

-----------------------------------------------------------------------

Summary of changes:
 src/language/stats/correlations.c |   14 ++-
 src/math/covariance.c             |  221 +++++++++++++++++++++++++++++++++++--
 src/math/covariance.h             |    6 +-
 3 files changed, 230 insertions(+), 11 deletions(-)


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