Subset data
It is easy to create a subset of a data.frame with the subset command in R.
For example one can remove NA values
subset_data <- subset(full_data, full_data$column_name!='NA')
Similarly, it is possible to remove whole columns.
less_column_data <- subset(full_data, select=c(1,4,5) )
Will keep columns 1, 4, 5.
less_column_data <- subset(full_data, select = -c(1,4,5) )
Will remove columns 1, 4, 5.