Learn in the textbookCross-Tabulation and Advanced Visualization of Correlation
DefinitionA cross-tabulation table (クロス集計表) places one item along the rows and another along the columns, and counts in each cell the number of records that meet both conditions.
ExplanationFor example, put the group (student or working adult) on the rows and whether people eat breakfast on the columns, then count the people in each combination. Adding total cells at the end of the rows and columns lets you check the overall count and the breakdown at once. Dividing each cell by its row total turns it into a proportion, so groups of different sizes can still be compared.
AnalogyJust as a school timetable fixes one class in the cell where a weekday meets a period, each cell here holds one count where a row condition meets a column condition.
Memory hookCross = two lines meeting like a plus sign.