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[Pspp-commits] [SCM] GNU PSPP branch, covariance, updated. v0.6.1-860-g3
From: |
John Darrington |
Subject: |
[Pspp-commits] [SCM] GNU PSPP branch, covariance, updated. v0.6.1-860-g3bbe45f |
Date: |
Sat, 17 Oct 2009 09:18:11 +0000 |
This is an automated email from the git hooks/post-receive script. It was
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the project "GNU PSPP".
The branch, covariance has been updated
via 3bbe45fcc70f8d059b4bf6715d629209b50fa48e (commit)
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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