Bins for incwage in the 1950 sample. How was the binning implemented? Rounded to the nearest bin value? Or is the incwage integrated variable the midpoint of the bin and any value of the source variable that falls in the bin is given the midpoint of the bin?

Also, the source variable US1950A_EARN has value increments of $100 and starts with 0, then 100, 200, 300, etc.

The integrated variable incwage has value increments of $100 and starts with $50, then 150, 250, 350, etc.

How exactly was the source variable converted to the integrated variable?