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4 results for “from:Stefan Björk”

Frequency and summary statistics table with different variables and categories
Stefan Björk · Jan 22, 2009 · r-help

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Algorithm for calculating McCall's T-scores
Stefan Björk · Dec 18, 2008 · r-help

I'm looking for a function or algorithm for calculating McCall's area transformed T-scores, but have not find any. An algorithm is described on http://www.visualstatistics.net/Visual Statistics Multimedia/normalization.htm, but this seem to be...

Relative frequency of cases in data frame matching a specified criteria
Stefan Björk · Jan 23, 2009 · r-help

I want to get the relative frequency of cases in a data frame that matches a specified criteria, omiting NA values. This seem so simple, but I can't come up with an effective way. nrow(data[data$variable>value...

Algorithm for calculating McCall's T-scores
Stefan Björk · Dec 18, 2008 · r-help

I seem to have solved this on my own: t.score.table <- data.frame(T=10:90,F=pnorm(10:90,mean=50.5,sd=10)) t.score <- function(x) { p <- ecdf(x) t <- cut(p(x),breaks=c(t...

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