Question

Yesterday I posted this question on Stats Exchange and based on the response I got, I decided to do some analysis using R’s src() function. It’s part of the “sensitivity” package.

I installed the package with no trouble, and then tried the following command:

sens <- src(seminars, REV, rank=TRUE, nboot=100)

sens is a new variable to store the results of the test

seminars is a data frame that I imported from a CSV file using the read.csv() command

REV is the name of a variable/column in seminars and my desired response variable

When I ran the command, I got the following error:

Error in data.frame(Y = y, X) : object 'REV' not found

Any thoughts?

Answer 1

From the documentation of src

   y: a vector containing the responses corresponding to the design
      of experiments (model output variables).

The input needs to be a vector (apparently) and you’re attempting to pass in a name (and not even quoting the name at that). Since REV isn’t defined (I’m guessing due to the error message) in the global environment it doesn’t know what to do.

From reading the documentation it sounds like what you want to do is pass sensitivity[,-which(colnames(sensitivity) == "REV")] (just the design matrix – you don’t want to include the responses) in as x and sensitivity[,"REV"] in as y.