Hi

Apologies if this query is very simplistic. I am using UKHLS data on individuals to look at changes in wellbeing as a result of commuting duration. In order to do so I wish to obtain a sample from the dataset for whom the value of reported commute duration (jbttwt) changes across different waves (years) of the data by say 5 mins or more. I have the variables:
pidp: person identifier

jbttwt: commuting time in mins (note: in appending my data I removed the existing wave prefix on all variable names so there is now multiple recorded values of jbttwt for one pipd reflecting different waves)

wave: a variable (created during the appending) that captures which wave that row of data is from i.e. which year's jbttwt is referred to

What command(s) can I use to create a variable that captures each person's commute change between waves in order to select a sample of only those who experience a change of say 5 mins?

Many thanks for any help.