In Stata quantity has inputs in both kg and grams. while unit =1 indicates kg and unit=2 indicates grams. How can I generate a new variable quantity_kg which converts all gram values into kg?
My existing dataset-
clear
input double(hhid quantity unit unit_price)
1 24 1 .
1 4 1 .
1 350 2 50
1 550 2 90
1 2 1 65
1 3.5 1 85
1 1 1 20
1 4 1 25
1 2 1 .
2 1 1 30
2 2 1 15
2 1 1 20
2 250 2 10
2 2 1 20
2 400 2 10
2 100 2 60
2 1 1 20
My expected dataset
input double(hhid quantity unit unit_price quantity_kg)
1 24 1 . 24
1 4 1 . 4
1 350 2 50 .35
1 550 2 90 .55
1 2 1 65 2
1 3.5 1 85 3.5
1 1 1 20 1
1 4 1 25 4
1 2 1 . 2
2 1 1 30 1
2 2 1 15 2
2 1 1 20 1
2 250 2 10 .25
2 2 1 20 2
2 400 2 10 .40
2 100 2 60 .10
2 1 1 20 1
// unit 1 means kg, unit 2 means g, and 1000 g = 1 kg
generate quantity_kg = cond(unit == 1, quantity, cond(unit == 2, quantity/1000, .))
Your example doesn't have any missing values on unit, but it does no harm to imagine that they might occur.
Providing a comment by way of explanation could be anywhere between redundant and essential for third parties.