DATA TABLES Kinds of variables… DISPLAYING ONE CATEGORICAL VARIABLE Frequency tables…Bar charts…Pie charts… EQUAL AREA PRINCIPLE.

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DATA TABLES Kinds of variables… DISPLAYING ONE CATEGORICAL VARIABLE Frequency tables…Bar charts…Pie charts… EQUAL AREA PRINCIPLE

DATA TABLE shirtTVpoliticssalarysinger blue5mod blue1liberal liberal3 green2mod teal2liberal Columns = Variables Rows =Individuals =Cases =Subjects Unique key? Do the rows have any particular sequence? Missing Data

Kinds of Variables CATEGORICAL --- nominal --- values are just labels ordinal --- values are just labels, but have a sequence QUANTITATIVE --- discrete --- only certain (separated) values are possible continuous --- all values are possible in some range

Frequency table - sex VALUECOUNTPERCENT (of column) Female4664% Male2636% TOTAL72100%

Frequency table - politics VALUECOUNTPERCENT (of column) Liberal4664% Moderate2231% Conservative4 6% TOTAL72100%

Frequency table - singing VALUECOUNTPERCENT 11622% 21622% 32332% 41217% 55 7% TOTAL72100%

EQUAL-AREA PRINCIPLE Areas are in proportion to data values.

Summary…Key ideas DATA TABLES Individuals, Variables… TYPES OF DATA Categorical (Nominal, Ordinal), Quantitative… FREQUENCY TABLE BAR CHART Equal area principle… PIE CHART