Trouble shooting

First thing if you have a problem, try to run the function with verbose set to TRUE, if there is a verbose argument. E.g.

normal.period <- subset(Oslo,it=c(1961,1990),verbose=TRUE)

The messages produced may give you a clue about the problem. Also try the examples provided in the manual, if you can find it (e.g. type ?subset'). Try to do the analysis with the data provided in esd`. The problem may be that the data structure is not quite right, that some attributes are missing, etc. Often the problem can be fixed re-setting the attributes.