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It is possible to choose a subset of the data for analysis in each year. For example, the data set house6311 contains an indicator DELSOUTH, which is 1 if a district is located in the south and 0 otherwise. To perform analyses on non-southern districts only, initialize a JudgeIt object (in this example, jud.ob) with the expression
jud.ob <- judgeit(...,subset=DELSOUTH==0,data=house6311)