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Displaying and Describing Categorical Data - Coggle Diagram
Displaying and Describing Categorical Data
3 rules of data analysis
make a picture to help you THINK about the patterns and relations
make a picture that will SHOW the important features and data
make a picture to TELL the others your findings
The area principle
fundamental principle of graphing data: area occupied by a part of the graph should correspond to the magnitud of the value it represents
frequency tables: Making piles
piles: we pile things together that go together
a frequency table records the totals and the category name
a relative frequency table displays the percentages rather than counts of the values in each category
this way we describe the distribution of a categorical variable
bar charts
displays the distribution of a categorical variable, showing the counts for each category next to each other for easy comparison
relative frequency bar chart draws attention to the relative proportion of the distribution
pie charts
shows the whole group of cases as a circle, the circle is divided onto sizes proportional to the fraction of the whole in each category
contingency tables
arranges the counts for two categorical variables
each cell of the table gives the count for a combination of values of the two variables
the frequency distribution of one of the variables is called its marginal distribution