How to refer to a data table column that has a name that is a number?

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.

Use backticks:


Or you can use list indexing:


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