37-stats

37-stats - Chapter 2: -categorical variable : identifies a...

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Chapter 2: - categorical variable : identifies a group membership. Column of values in a data table that identifies cases with a common attribute (also called nominal variable) -numerical variable: describes quantitative attributes of the rows, allow us to perform calculations Ex: Heights, Weights, incomes, ages, counts -recode : to build a new variable from another, such as by combining several distinct values into one -aggregate: to reduce the number of rows in a data table by counting or summing values within categories (making a column with “totals”) -time series : a sequence of data recorded over time - time plot: a graph of a time series showing the values in chronological order -frequency: the time spacing of data recorded in a time series Chapter 3: Frequency table : a tabular summary that shows the distribution of a variable -Shows proportions (divide frequency by total amount) relative frequency : the frequency of a category divided by the number of cases; a proportion or percentage. *Unless you need to know the exact counts, a chart or plot beats a table
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This note was uploaded on 10/26/2010 for the course BUAD 310 at USC.

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37-stats - Chapter 2: -categorical variable : identifies a...

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