Erratum: Speaking Stata: Loops,again and again

The last code example in section 6.2 of this column (Cox 2020) is slightly mangled.

On page 1014, the first line of code would be better as

. unab list: price-gear_ratio

and on page 1015, correspondingly the first row of the matrix displayed should be

price 0 .449

followed by the rest of the matrix as displayed there.

Many thanks to Chris C. Martin for this correction.