check this out
http://www.r-bloggers.com/pivot-tables-in-r/
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Hi:
Here's a way using the reshape2 package.
library('reshape2')
rsub <- subset(rtest, concept %in% c('8.2.D', '8.3.A', '8.3.B'))
# want year ahead of concept in the variable list
rsub <- rsub[, c(1:4, 9, 5:8)]
cast(rsub, id + test + subject + grade + year ~ concept, value_var = 'per_corr')
# Us
Hello,
I have a dataset with student performance on a math test. There are
multiple cases for each student (identified by id) and the concept as a
variable.
> rtest
id test subject gradeconcept correct tested per_corr
year
11 83 Mathema 8 8.2.D 1
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