better example of use

[tombisho]

e.g. generating a variable for prevalent diabetes?

Date > something, diabetes = 1?

Would expect a mix of 0 and 1 but with DS no way of telling if this is correct or not (e.g. from mean)

perhaps a problem with the logic test and date or with a indicator variable as a character/factor?

[tombisho]

example is ds.Boole with a > sign and put < instead. You can count the 1s and 0s but if you don't know what to expect, you don't know if this is working properly.