Apply functions to subsets of your data

This video explains two ways to apply functions to subsets of the data, with illustration using histograms and our example dataset / syntax, which has been updated to include this syntax, which is also copied below.

par(mfrow=c(2,3))


##   select cases to include by specifying value of factor variable

annie<-hist(AllVars$NewConf1,
col="purple",
breaks=4,
ylim=c(0,12))


ed<-hist(AllVars$NewConf1 [AllVars$TwoPlusComputer == 1],
col="light blue",
breaks=4,
ylim=c(0,12))


frankie<-hist(AllVars$NewConf1 [AllVars$TwoPlusComputer == 0],
col="pink",
breaks=4,
ylim=c(0,12))

##  select cases by refering to different datasets
## to do this you need to first use the
# AllVars<-data.frame(cbind(var, var2, varn)
# then do the subset command to make a new dataset
#  NewDataSetName<- subset(AllVars, Variable == 1)

frannie<-hist(AllVars$NewConf1,
col="purple",
breaks=4,
ylim=c(0,12))

fred<-hist(Geek$NewConf1,
col="blue",
breaks=4,
ylim=c(0,12))

frank<-hist(NonGeek$NewConf1,
col="red",
breaks=4,
ylim=c(0,12))