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Ralph Winters's Discussions (153)

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Discussions Replied To (117) Replies Latest Activity

"If you think that you need all of the variables in the model, then there may be anot…"

Ralph Winters replied Feb 28, 2012 to Excluding variables from a logistic regression model based on correlation

 2 Feb 28, 2012
Reply by Ralph Winters

"Have you tried computing Pearson correlation coefficients for all of your pairs? It…"

Ralph Winters replied Feb 28, 2012 to How to check linearity when the number of IVs are large (200+)

 7 Apr 27, 2012
Reply by Ravi Sangal

"Ross - I have not seen an option to score a dataset.  It would be up to you to score…"

Ralph Winters replied Oct 4, 2011 to Cluster analysis with categorical variables ?

 29 Oct 4, 2011
Reply by Ralph Winters

"Certainly eliminating the spammers helps.  What I got from this article was that whe…"

Ralph Winters replied Aug 22, 2011 to 63% of Readers Don't Care About Your Comments

 2 Aug 22, 2011
Reply by Ralph Winters

"You need at least a basic understand of the algorithms before you use them.  E,g, So…"

Ralph Winters replied Aug 10, 2011 to Ordinal level of measurement in data mining algorithms.

 8 Aug 10, 2011
Reply by Miles Garnsey

"If you look at the DJIA charts at another source (MSN) for July 25, it doesn't have…"

Ralph Winters replied Aug 9, 2011 to Stock market, July 25: Data glitch, or true volume spike?

 5 Aug 9, 2011
Reply by Vincent Granville

"Bootstrapping and cross fold sampling techniques can be used to "prove" whether or n…"

Ralph Winters replied Aug 9, 2011 to Ordinal level of measurement in data mining algorithms.

 8 Aug 10, 2011
Reply by Miles Garnsey

"Check the value against chi-square to see if the results are reasonable.  If not, ta…"

Ralph Winters replied Aug 3, 2011 to Gamma Models in insurance

 4 Aug 4, 2011
Reply by K.Kalyanaraman

"There are two forms of the chi-square test.  One is of them is the one-way (or goodn…"

Ralph Winters replied Jul 28, 2011 to One indicator variable, two categories, statistically significant test?

 13 Jul 28, 2011
Reply by K.Kalyanaraman

"Actually both answers are correct depending upon the assumptions: You can use a Z-te…"

Ralph Winters replied Jul 28, 2011 to One indicator variable, two categories, statistically significant test?

 13 Jul 28, 2011
Reply by K.Kalyanaraman

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