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From Phil Steitz <>
Subject Re: [math] 2.1 Release plan
Date Thu, 11 Mar 2010 16:55:30 GMT
Gilles Sadowski wrote:
> Hi.
>> [...]  OLS regression (350 - good catch!) also
>> obviously needs to be fixed.  Thanks to all for testing.
> There is indeed a difference from what CM 2.0 computed but maybe that it is
> not a problem after all, and is just to be expected from the implementation
> change: some failing tests compare values produced by CM 2.0 to values
> produced by the current code allowing a tolerance of 1e-13. When setting the
> tolerance to 1e-12, the tests pass. Those tests cannot prove that the values
> from CM 2.0 were "better" than the current ones.
> Looking into the issue with Dimitri, the problem initially referred to in
> MATH-350 may in fact be related to the user's code. I'm waiting for her
> feedback in order to write some (possibly final) comments on JIRA.

Great.  One (non-authoritative, but at least indicative) resource to
use is R verification.  There is a framework for verification tests
comparing results to R in src/tests/R.  In some cases for
(bivariate) regression, the reference values are also compared
against NIST reference data.

> Best,
> Gilles
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