I have a dataframe (let's call it df) that contains the following types of data:
quantile '1980' '2000'
0 -2.36 -1.70
0.01 -2.35 -1.64
0.02 -2.35 -1.54
and so on...
I want to be able to refer to the columns but, for example, using df$1980 is not valid.