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Suppose you want to merge two datasets in Stata

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Suppose you want to merge two datasets in Stata. The variable for matching is yob, which stands for year of birth. The dataset in memory is population census data from Canada. That is, the dataset has information on every single resident of Canada. The dataset that you want to merge in has data on the level of GDP per capita in the year of birth. Which of the following commands should you use?

a) merge 1:1 yob using “GDPpercapita.dta”

b) merge m:1 yob using “GDPpercapita.dta”

c) merge 1:m yob using “GDPpercapita.dta”

d) None of these commands will work.