Flashcards in Lecture 3 Deck (14)

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1

## What are the three charecteristics of a sensitive research measure?

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1. Valid.

2. Reliable.

3. Sensitive – discriminating.

2

## When is a scale valid?

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A scale is valid if it measures what it is supposed to measure.

3

## What does validity refer to?

### Validity also refers to how well a scale predicts other variables:

4

## When a scale predicts other variables what does it cause?

### When used this way, the scale is called the predictor measure and the measure predicted is called the criterion.

5

## What is high validity?

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1. Least effected by irrelevant factors.

2. Maximal sensitivity to changes in relevant factor.

3. Few inferences.

Two steps to increase purity, directness, validity, and sensitivity:

6

## What are two steps to increase purity, directness and validity?

### Be clear in what you want to measure.

7

## What is reliability?

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The consistency of measurement.

Consistency can be conceptualized in different ways:

Therefore, there are different types of reliability.

8

## How is reliability usually measured?

### Correlation

9

## What are the four scales of measure?

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Nominal.

Ordinal.

Interval.

Ratio.

10

## What is a nominal score of measurement?

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Scale of measurement in which the scores are classified by name.

11

## What is the ordinal scale of measurement?

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Scale of measurement in which scores are classified by rank.

12

## What are the disadvantages for an ordinal scale of measurement?

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Lacks information, there may be big differences between scores:

13

## What are interval scales of measurement?

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Scale of measurement that provides not only the order between scores, but also the magnitude of the distance between them.

14