Hi.
I am using a data set which contains more than 600,000 observations on household expenditure.

The household expenditure varibale is " nf_value" which is string. (appeared in red color )

Then I coverted it into numeric using 'destring command' and named as "expend". (digits changed into blue color )

However, stils I can not do any mathematical operations correctly using "expend"

(I think it is beacuse some 'lable values' assinged to each cell.)

Can anybody help me to convert this 'blue digit column' in to 'black digit column'.; simply to normal integer or byte variable?
psu a0 snumber hhno nhh result nf_code nf_value expend
39 96375 1 1 1 1 2001 400 400
39 96375 1 1 1 1 2002 48 48
39 96375 1 1 1 1 2003 87 87
39 96375 1 1 1 1 2101 350 350