Chapter 19 Correlation Flashcards Preview

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Flashcards in Chapter 19 Correlation Deck (16)
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1

Biserial (correlation coefficient)

Correlation used where one variable is artificially dichotomous; formed by categorising from an underlying continuous and normal distribution

2

Correlation

A (standardised) measure of relationship of co-variance between two variables

3

Correlation coefficient

Number signifying strength of correlation between two variables

4

Curvilinear correlation

Correlation between two variables with low r value because the relationship does not fit a straight line but a good curve

5

Negative correlation

Correlation where, as values of one variable increase, related values of another variable tend to decrease

6

Positive correlation

Correlation where, as values of one variable increase, related values of another variable tend to increase

7

Correlation strength

Measure of the closeness of the relationship, indicated by a number between 0 and 1 (positive or negative). Strength does not indicate significance.

8

Dichotomous variable

Variable with just two exhaustive values (e.g. male/female)

9

Linearity

Extent to which a relationship between two variables can be represented by a straight line rather than, say, a curved line

10

Pearson's product-moment correlation coefficient

Parametric measure of correlation

11

Phi coefficient

Measure of correlation between two truly dichotomous variables

12

Point biserial correlation

Measure of correlation where one variable is truly dichotomous and the other is at interval level

13

Range restriction

A selection of cases form a larger potential data set, which has the effect of distorting the true population correlation

14

Scatterplot

Diagram showing the placement of paired values from two variables on a two-dimensional chart

15

Spearman's rho

Non-parametric, ordinal level measure of correlation; Pearson correlation on ranks of the paired raw scores

16

Variance estimate

Estimate of variance in a variable accounted for by the correlation of another variable (or other variables) with it