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At some point during a state's existence, the electoral map is redrawn to adjust for changes in the demographics of the districts. Specifying whether the districts in one election are identical to the previous one are vital to an accurate representation of the system.
By default, judgeit assumes that if two consecutive years have the same number of districts in the map, then no redistricting has taken place.
To set a redistricting occurrence manually, judgeit accepts as an option same.districts, which indicates whether the previous election used the same districting plan. In many states in the American system, the easiest way to do this is to have a variable specifying the election years and note whether the year ends in 2 (year %% 10 == 2). For other situations, you will need to add a specially coded variable to the data frame and set same.districts to this value.