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2008 Sep 03
2
basic dataframe question
...frame? How do I change this so that it's retained as a logical data type? I've tried a couple of things but to no avail.
Here's my example code:
# Exercise 4-1 in Non-Detects and Data Analysis. Dennis Helsel. 2005.
# "Create two new variables in the Interval Endpoints format, StartCu and EndCu,
# that will contain the same information given by the current variables
library(NADA)
data(CuZn)
names(CuZn)
StartCu <- ifelse(CuZn$CuCen == "TRUE", 0, CuZn$Cu)
EndCu <- CuZn$Cu
CuIEP = data.frame(cbind(Cu = CuZn$Cu, CuCen = CuZn$CuCen, StartCu, EndCu))
class(CuZn$CuC...