8_26_2009 - Stat 311 Graphics Descriptive Statistics...

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Stat 311 - Graphics
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Descriptive Statistics Descriptive Statistics – Use numerical and graphical summaries to characterize observed data. - Key is to tell the ‘story’ of the data. Not to the inference part yet.
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Terminology Raw data – Data that have been collected but not processed. Dataset – Complete set of raw data. Variable – Characteristic that differs for each individual.
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Terminology Observational unit (observation/individual) – Single individual participant. Sample size – # of observational units in a study, generally denoted by “n”
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Two Types of Variables Categorical – Consists of groups or categories (may not have ordering). An individual is in either in one category or in one of the others (when looking at a particular category, these are the only two options). Proportions often describe data which come from categorical variables
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Quantitative – Data that has a numerical value. Typically a measurement or a count.
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8_26_2009 - Stat 311 Graphics Descriptive Statistics...

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