Ｊ. Ｍ.

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bio website location age member for 3 years, 4 months seen Jun 24 at 0:09 profile views 141

No, his mind is not for rent
to any god or government.
Always hopeful, yet discontent.
He knows changes aren't permanent,
but change is.

— Rush, Tom Sawyer

Taking an externally-imposed and much-needed break from SE activities.

E-mail (flipped ROT13): zqd˙ʎʌuzʇ@ʇɐʌǝɥʇʌssqɹǝɥɟuɹʎɔ
Any code I've posted here I place under the WTFPL.

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 Aug9 awarded Yearling Jul7 awarded Notable Question Mar29 awarded Necromancer Aug9 awarded Yearling Aug5 comment How do you find causal relationships in data? Causation is just not something you can squeeze from the numbers... so, repeat after me: causation is not correlation, causation is not correlation... Mar21 awarded Nice Answer Feb5 comment Why not approach classification through regression? I voted to migrate to CV; I think it stands a better chance of getting answered there than here. Dec17 awarded Popular Question Dec5 revised What algorithm is used in linear regression? seminormal equations added Dec5 comment What algorithm is used in linear regression? If you read this old book, you should also be looking into Åke Björck's Numerical Methods for Least Squares Problems, which has stuff not discussed in Lawson/Hanson. The routines included in the Lawson/Hanson book are available from Netlib. Dec4 awarded Nice Answer Oct28 comment Reporting results of simple linear regression: what information to include? "Are there hard-and-fast rules for how much information to report" - it really depends on what you want to do after the regression. One might be happy with just the correlation coefficient; one might need the Durbin-Watson value on top of that, and still another one might want to see the diagonal of the hat matrix... it really depends. Oct26 awarded Analytical Oct26 revised What algorithm is used in linear regression? various improvements Oct3 answered Testing for linear dependence among the columns of a matrix Sep14 comment How can I test the quality of a RNG? Have you seen Diehard? Sep7 comment Chi-square test for checking if values are close to zero? Yes it does. Which means more work for you to do, i.e. a test for normality. Otherwise, I'm no longer up to date with what they use when the errors are non-normal. Sep7 comment Chi-square test for checking if values are close to zero? I think you're supposed to do a $t$-test, not a $\chi^2$-test. See this. Aug29 comment Meaning of p-values in regression Gavin's answer in the question @cardinal linked to says it well. Aug13 comment Ways of finding associations in time series Correlations, eh?