[R] Computing Median for Subset of Data

From my larger data set I created a subset of it by using:  subset_1 - subset(timeuse, IndepTrans = 1, Physical = 1) where my larger data set is timeuse and the smaller subset is subset_1. The subset was conditioned on IndepTrans equaling 1 in the data and Physical equaling 1 as well. I want

[R] Gwet's AC1

R has functions for computing kappa, fleiss's kappa, etc., but can it compute Gwet's AC1? Thanks, Matt. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read

[R] Factor Analysis/Inputting Correlation Matrix

Can someone please direct me to how to run a factor analysis in R by first inputting a correlation matrix? Does the function factanal allow one to read a correlation matrix instead of data vectors? Thanks, Matt. [[alternative HTML version deleted]]

[R] Prediction Intervals vs. Confidence Bands

When I ask R to compute: predict(data, int = c), following a linear regression, what is it computing exactly? How are these lower and upper prediction limits different than what I would get for confidence limits? Thanks, Matt. [[alternative HTML version deleted]]

[R] Book on R's Programming Language

Can someone please recommend to me a book on the programming language that R is based on? I'm looking for a foundational book that teaches the logic of the S language. It seems that knowing the underpinnings of the language can only make using R a bit easier. Any leads are greatly appreciated