So far we have been exploring and analysing a single set of data on its own. Data almost never exist on their own; there is generally some background, some other data for comparison. Even within a single set of data, it is possible to extract subsets which are natural groupings. Comparisons can then be made amongst these subsets. This chapter will describe methods for comparing sets of data. But in order to have some data to work on, you need to collect some more information on houses.
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