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

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## 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

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