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Lecture

Semester 1 - Nov 11, 2013 - Bivariate Analysis - Ordinal Measures.docx

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Department
Communication Studies
Course
COMM 2002
Professor
Heather Pyman
Semester
Fall

Description
November 11, 2013 Bivariate Analysis – Ordinal Measures The nature of the relationship • What is the direction of the relationship positive or negative • How strong is the relationship • Is it statistically significant -correlation coefficient, 0-.25 is weak, .26-.50 is a medium relationship, above .50 is a strong relationship -chi-square testing the hypothesis -expected values multiplying the row totals multiplied by the column totals and dividing by the sample size Ordinal Level Data • Logic = Proportional Reduction of Error (PRE) • Measures which tell us whether knowing the value of one variable reduces chance of making an error in predicting the value of the other • Correlation value which varies between -1 and +1 • Indicates direction and strength Ordinal Strength Measures • The measures use the ordering of the categories in making their calculations • They are based on a comparison of all pairs of cases. Each case with each o
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