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Descriptive Statistics

# Descriptive Statistics - ExtraCredit NumericData ofthecases...

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1 Descriptive Statistics 3/30/2011 Extra Credit Politopia or Political Compass Critique Measurement: what are they trying to measure? What are the challenges in doing so? Survey design: what were potential problems? Overall assessment Numeric Data Organized in Data Matrix Array of rows and columns that stores the values of the cases. Row=case Column=variable Descriptive Statistics We “describe” variables using simple statistical information. Not usually for inference Usually univariate Not bivariate or multivariate Descriptive Statistics Values for each case General nature of variable Frequencies of values Typical value Dispersion Frequency Distribution Number of observations for each value of a variable. Tables Or Charts

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2 Frequency Distribution (1) View the Data (2) If many possible values, (4) Generate percentages (5) Label appropriately establish class intervals (3) Determine how many observations fall into each class Example States Dataset Percent over 25 with High School Frequency Percent Table 3. High School Education Levels of the States, 2000
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Descriptive Statistics - ExtraCredit NumericData ofthecases...

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