>>Why not...
>>
>>

>>use trial
>>go top
>>scan
>>do case
>>    case trial.min_sex = 'F'
>>        replace min_f with .t.
>>        replace min_m with .f.
>>
>>    case trial.min_sex = 'M'
>>        replace min_f with .t.
>>        replace min_m = .f.
>>endcase
>>endscan
>>

>
>even better...
>
>repl all min_f with .T. for min_sex = 'F'
>repl all min_m with .T. for min_sex = 'M'

REPL ALL MIN_F WITH MIN_sex = 'F', MIN_M WITH MIN_SEX = 'M'