YPDKLM: irregular variable dist.
Dear US team,
I have recently started working with the alcohol consumption variables you provide in the youth self-completion questionnaire. Graphing the distribution of ypdklm, I found that the variable is distributed in a very irregular way. The questionnaires show that the question has 5 different response options. But in 2010, 2012 and 2014 the data shows 6 different response options, while in 2009, 2011, 2013 and 2015 the data shows 5 different response options. I include the histogram as an attachment in this email.
Could you please provide me with some clarification?