Quick Stata tip:
keep if inlist(state, "AL", "AK", "AZ")
is the same as:
keep if state=="AL" | state=="AK" | state=="AZ"
And:
keep if inrange(distance, 10, 91)
is the same as:
keep if distance>=10 & distance<=91
keep if inlist(state, "AL", "AK", "AZ")
is the same as:
keep if state=="AL" | state=="AK" | state=="AZ"
And:
keep if inrange(distance, 10, 91)
is the same as:
keep if distance>=10 & distance<=91
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