Hello everyone I'm a beginner in Stats and R, I'm using R 2.10.1. I need to create a multivariate qq plot, there is 8 variable group with each has 55 number of input. An example of what I did so far, just to get my point out: > data=read.csv(file.choose(),header=T) > data country village group av_expen P2ary_ed no_fisher 1 Cook Islands Aitutaki D 5239.12747 0.6666667 666.99986 2 Cook Islands Mangaia C 4587.36188 0.6021505 207.69228 3 Cook Islands Palmerston B 7784.31874 0.1666667 24.00000 ... 53 Wallis And Futuna All Futuna D 11023.30674 0.2789855 1056.63143 54 Wallis And Futuna Halalo B 8783.54979 0.2794118 153.51715 55 Wallis And Futuna Vailala A 12231.95400 0.2395833 100.00000
The problem I'm having starts now. I use the following command trying to work out the mahalanobis before plotting the QQ plot, but the following error is prompt: > mah=mahalanobis(data,apply(data,2,mean),var(data)) Error in FUN(x, aperm(array(STATS, dims[perm]), order(perm)), ...) : non-numeric argument to binary operator In addition: Warning messages: 1: In mean.default(newX[, i], ...) : argument is not numeric or logical: returning NA 2: In mean.default(newX[, i], ...) : argument is not numeric or logical: returning NA 3: In mean.default(newX[, i], ...) : argument is not numeric or logical: returning NA 4: In mean.default(newX[, i], ...) : argument is not numeric or logical: returning NA 5: In mean.default(newX[, i], ...) : argument is not numeric or logical: returning NA 6: In mean.default(newX[, i], ...) : argument is not numeric or logical: returning NA 7: In mean.default(newX[, i], ...) : argument is not numeric or logical: returning NA 8: In mean.default(newX[, i], ...) : argument is not numeric or logical: returning NA 9: In mean.default(newX[, i], ...) : argument is not numeric or logical: returning NA 10: In mean.default(newX[, i], ...) : argument is not numeric or logical: returning NA Then I thought to myself, maybe the error I got the wrong input for variable. So I adjust the variable to see is my assumption was correct to the command below, but I still got the same error: > mah=mahalanobis(data,apply(data,2,mean),var(no_fisher)) I absolutely got no clue where I got wrong and don't know how to fix it. Anyways I thought to myself, no worries I don't use mahalanobis then I'll still try the QQ plot and see what happen. This is the command and the error I got from it: qqplot(qchisq(ppoints(data),ncol(data),data) Error in qchisq(p, df, lower.tail, log.p) : Non-numeric argument to mathematical function -- View this message in context: http://n4.nabble.com/producing-a-QQ-plot-tp1693228p1693228.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.