Backing up a step: On Wednesday, January 13, 2016, CG Pettersson <cg.petters...@lantmannen.com> wrote:
> R version 3.2.3, W7 64bit. > > Dear all! > > I am trying to make pls-regression using plsr() from package pls, with > Mevik & Wehrens (2007) as tutorial and the datasets from the package. > Everything works real nice as long as I use the supplied datasets, but I > don´t understand how to prepare my own data. > This is what I have done: > > > frame1 <- data.frame(gushVM, I(n96)) Which ISN'T what the example you're following did. You didn't name the construct. frame1 <- data.frame(gushVM, n96 = I(n96)) so R can't find anything named n96 within frame1 because it's probably named some variant on I(n96). str(frame1) would have told you this. Sarah > > Where gushVM is a vector with fifteen reference analysis values of a > quality problem in grain and n96 is a matrix with fifteen rows and 96 > columns from an electronic nose. I try to copy the methods as in 3.2 in > Mevik & Wehrens, and want to keep n96 as one variable to avoid addressing > 96 different variables in the plsr call. If I don´t use I() in the call I > get 96 variables instead. > Looking at the dataframe by summary(frame1) get a return quite like > summary(gasoline) from the package (not shown here). > But when I try to use plsr() with my own data it doesn´t work due to an > error in the data structure: > > > pls1 <- plsr(gushVM ~ n96, data = frame1) > Error in model.frame.default(formula = gushVM ~ n96, data = frame1) : > invalid type (list) for variable 'n96' > > > So, n96 has turned into a list, and that is a problem. If gushVM is a > vector (one variable) och a matrix (five variables) does not seem to change > anything, managing n96 is the problem > I have tried all alternative ways of creating a proper data frame > suggested in the article with exactly the same result. > I have tried the documentation for data.frame() but I probably don´t > understand what it says. > > What should I do to change "n96" into something better than "list"? > > Thanks > /CG > > Med vänlig hälsning/Best regards > CG Pettersson > Scientific Project Manager, PhD > ______________________ > Lantmännen Corporate R&D > Phone: +46 10 556 19 85 > Mobile: + 46 70 330 66 85 > Email: cg.petters...@lantmannen.com <javascript:;><mailto: > cg.petters...@lantmannen.com <javascript:;>> > Visiting Address: S:t Göransgatan 160 A > Address: Box 30192, SE-104 25 Stockholm > Webb: http://www.lantmannen.com<http://www.lantmannen.com/> > Registered Office: Stockholm > Before printing, think about the environment > > > [[alternative HTML version deleted]] > > -- Sarah Goslee http://www.stringpage.com http://www.sarahgoslee.com http://www.functionaldiversity.org [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
