Hi, I am having trouble dropping certain observations in my dataset. For example, suppose I am trying to find out the income of individuals who went to Disneyland in both 2006 and 2007. Whenever I type "keep if year==2006" and "keep if year==2007," I only end up dropping those observations that went to Disneyland in one year, but may not have gone during the other. Sorry if this is unclear.
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