a vector that gives a desired sort order of the chinook repunits

This is just an example of what one would use as levels in order to get the chinook repunits in a desired sort order after analysis. The issue here is that repunit in the input data frame to most functions must be a character vector, not a factor. But, after analysis you can always make them a factor again and use a vector like this one to specify the levels.

Source

Made it up!