I have disabled html text editing mode, thanks to Prof. Ripley for the kind reminder.
Given three geological devices that takes 5 readings at 4 environmental conditions (A to D). What will be the proper approach to select the most reliable device ? m1 <- c(73,52,49,53,83,43,58,94,53,62,75,66,41,72,70,75,57,59,85,84) m2 <- c(31,38,30,35,36,26,27,38,22,31,24,35,36,31,38,33,32,28,33,30) m3 <- c(65,57,36,40,36,30,40,34,37,40,33,33,37,29,37,37,30,33,40,35) names(m1) <- rep(LETTERS[1:4], each=5) names(m2) <- rep(LETTERS[1:4], each=5) names(m3) <- rep(LETTERS[1:4], each=5) Before writing this email, I have tried to compare the sd for each device at each condition, but ran into obstacle on how to formulate the null hypothesis. Alternative solution tried was ANOVA, I am unsure whether it can help, as it compares the differences in means of each group. Thanks ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
