Hi, I wonder why the data about some employed (at work) people's travel related to working(180501)could be zero.

Hi, I found that the data about many employed people’s travel related to working is 0. I think it’s impossible. Can you tell me why? Thank you very much!

If you account for the respondents who reported for a weekend (using the variable DAY) or a holiday (using HOLIDAY) the number of respondents with a value of 0 for Travel Related to Work decreases significantly.

I hope this helps.