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Lecture 4

Lecture 4 - Correlation - October 4.docx

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Department
Psychology
Course
PSY201H1
Professor
Kristie Dukewich
Semester
Fall

Description
October 4, 2012. Lecture 4 – Correlation Scatter Plots  Variable on X, variable on Y  Individual points plotted displayed relationship between X and Y  “Line of Best Fit” drawn in where largest density of points are/most points are touching/close to line  “perfect” relationship when all points fall along line; extremely rare o But in this case when you know X, you can find Y and vice versa7  Help us choose the right analysis o Linear = Pearson correlation coefficient  If on interval or ratio scale  If not, see text o Non-linear = Special treatment  (beyond this course) o Check for outliers  Scores far away from mothers  How far is far? Calculating a Pearson Correlation Coefficient  Convert all your X scores to z-scores using the SD and Mean of X  Convert all your Y scores to z-scores using the SD and Mean of Y  Multiply your
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