Lecture 2_graphs & frequency dists

Lecture 2_graphs & frequency dists - 1/12/2010...

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1/12/2010 1 Displaying Data: Graphs & Frequency Distributions 1 Why Graph or Table the Data? • Helps summarize data into a form that can be easily/quickly communicated • Provides quick snapshot of the scores • Useful for screening your data – Data entry errors and aberrant responses can be easily spotted in a frequency table should be reviewed prior to analyzing the data 2 Frequency Distributions • A frequency distribution is a table that illustrates the dispersion of scores across the score scale – Displays the number (or percent) of individuals that obtained a particular score or fell in a particular category – Provides a picture of where people respond across the range of the measurement scale – Graphs data for a single variable 3
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1/12/2010 2 Example Frequency Distribution • A sample of 50 USC students were asked about their extent of exercise per month • Gender was coded 1 for female and 2 for male in the sample 4 ?? Correct Frequency Distribution for Gender in the Sample 5 Making a frequency distribution table for the data allowed us to catch data entry errors before computing any further sample statistics Information Contained in Frequency Distribution Tables • Frequency – the number of individuals that obtained a particular score (or response) • Percent – The corresponding percentage of individuals that obtained a particular score • Cumulative Percent – Percentage of individuals that fell at or below a particular score (not relevant for nominal variables) 6
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1/12/2010 3 Ungrouped Frequency Distributions • When there are only a few different scores in the data for a variable, like gender with
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Lecture 2_graphs & frequency dists - 1/12/2010...

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