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9 results for “from:Daniel Weitzenfeld”

summary() after changing contrasts
Daniel Weitzenfeld · Aug 9, 2012 · r-help

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is get() really what I want here?
Daniel Weitzenfeld · Oct 19, 2010 · r-help

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is get() really what I want here?
Daniel Weitzenfeld · Oct 19, 2010 · r-help

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cv.lm only bivariate; other options for prediction intervals
Daniel Weitzenfeld · Oct 22, 2010 · r-help

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cv.lm() broken; cross validation vs. predict(interval="prediction")
Daniel Weitzenfeld · Oct 22, 2010 · r-help

<< repost because previous attempt was not plain text, sorry! >> Hi Folks, I have a pretty simple problem: after building a multivariate linear model, I need to report my 95% confidence interval for predictions based on future observations. I know that...

RODBC with MySQL sees tables, but queries return zero rows
Daniel Weitzenfeld · Apr 14, 2011 · r-help

Hi All, I'm using RODBC to tap into MySQL on a remote server. It appears like the connection is successful: I can see all tables and columns in my database. However, queries return zero lines, including queries I've...

Optimal Y>=q cutoff after logistic regression
Daniel Weitzenfeld · Feb 13, 2011 · r-help

Hi, I understand that dichotimization of the predicted probabilities after logistic regression is philosophically questionable, throwing out information, etc. But I want to do it anyway. I'd like to include as a measure of fit % of observations correctly classified...

symmetric (& square) contingency table from dataset of unordered pairs
Daniel Weitzenfeld · Mar 24, 2011 · r-help

Hi Everybody, I have a data set in which each observation has a pair of students, with each kid id'd by a 4 digit number: > head(PAIRS) student1 student2 2 2213 2200 4 2198 2195 5 2199 2191 6...

problems with getting R to share library with rpy/rpy2
Daniel Weitzenfeld · Jun 12, 2011 · r-sig-mac

I'm a unix newbie having some issues getting either rpy or rpy2 to install. 1) Problem 1: Getting R to share it's library When I try to install rpy2, I get this error: running build_ext /Library/Frameworks...

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