Scales of Measurement & Desig

Question 1

Validity of a Test

Answer 1

Is the extent to which it measures what it claims to measure

Question 2

Can a test be Reliable and Valid?

Answer 2

To the extent that a test is unreliable it cannot be valid

e.g. weighing on a scale that consistently adds 10 lbs…. it is reliable but not valid

Question 3

A test is valid

Answer 3

To the extent that inferences made from it are appropriate, meaningful and useful.

Question 4

Three categories of validity evidence

Answer 4

Content Validity
Criterion-Referenced Validity
Construct Validity

Question 5

Content Validity

Answer 5

Is determined by the degree to which the questions, tasks, or items on a test are representative of the universe of behavior the test was designed to sample

If the sample (specific items on the steps) is representative of the population (all possible items), then the test possesses content validity

Question 6

Face Validity

Answer 6

Is not really a form of validity at all
A test has Face Validity if it looks valid to test users, examiners and especially, the examiner.
Should not be confused with Objective Validity

Question 7

Objective Validity

Answer 7

Is determined by the relationship of test scores to other sources of information

Question 8

Criterion-Related Validity

Answer 8

Is demonstrated when a test is shown to be effective in estimating an examinee’s performance on some outcome measure. The variable of primary interest is the outcome measure, called a CRITERION.

Question 9

Two different approaches to Validity evidence

Answer 9

Concurrent Validity

Predictive Validity

Question 10

Concurrent Validity

Answer 10

Criterion measures are obtained at approximately the same time as the test scores

Question 11

Predictive Validity

Answer 11

The criterion measures are obtained in the future (usually months/years after the test scores are obtained.
E.g., college entrance exams

Question 12

Characteristics of a good Criterion

Answer 12

• Must itself be reliable if it is to be a useful index of what the test measures
• A criterion measure must also be appropriate for the test under investigation
• All criterion measures should be described accurately, and the rationale for choosing them as relevant criteria should be made explicit
• A criterion must also be free of contamination from the test itself

Question 13

Criterion

Answer 13

Is any outcome measure against which a test is validated.

It can be most anything

Question 14

Validity Coefficient

Answer 14

See pg 76
The validity coefficient is always less than or equal to the square root of the test reliability multiplied by the criterion reliability.

In other words, to the extent that the reliability of either the test of the criterion (or bothz0 is low, the validity coefficient is also diminished.

Question 15

Criterion Contamination

Answer 15

Potential source of error in test validation
The criterion is “contaminated” by its artificial commonality with the test
Also possible when the criterion consists of ratings from experts.

Question 16

Concurrent Validity

Answer 16

• Test scores and criterion information are obtained simultaneously.
• Usually desirable for achievement tests, tests used for licensing or certification, and diagnostic clinical tests.
• Indicated the extent to which test scores accurately estimate an individual’s present position on the relevant criterion.

Question 17

Predictive Validity

Answer 17

• Test scores are used to estimate outcome measures obtained at a later date.
• Relevant for entrance exams and employment tests—common endeavor of thies tests:determining who is likely to succeed at a future endeavor.

Question 18

Regression Equation

Answer 18

Describes the best-fitting straight line for estimating the criterion from the test
Pg. 77

Question 19

Validity Coefficient

Answer 19

Pg 78

The higher the validity coefficient, the more accurate the test is in predicting the criterion

Question 20

Standard Error of Estimate

Answer 20

Pg. 78

The margin of error to be expected in the predicted criterion score

Question 21

Standard Error of Measurement (SEM)

Answer 21

This, like the SEE index help gauge margins of error.

It indicates the margin of measurement error caused by unreliability of the test whereas SEE indicated the margin of prediction error caused by imperfect validity of the test

Question 22

Decision Theory

Answer 22

Pg 78
Proponent of this theory stress that the purpose of psychological testing is not measurement per se, but measurement in the service of Decision making

Question 23

False positives

Answer 23

Some people predicted to succeed will in fact fail

Question 24

False Negatives

Answer 24

Collectively known as “misses”

Some predicted to fail would, if given the chance, succeed

Question 25

Hit Rate | Hit Rate=

Answer 25

- The test has made an inaccurate prediction - Is the proportion of cases in which the test accurately predicts Sussex’s or failure =(hits)/(hits+misses)

Question 26

Decision Theory proponents make two fundamental assumptions about the use of selection tests:

Answer 26

1. The values of various outcomes to the institution can be expressed in terms of a common utility scale (e.g., profit-loss) 2. In institutional selection decisions, the most generally useful strategy is one that maximizes the average gain on the utility scale (or minimizes average loss) over many similar divisions

Question 27

Construct

Answer 27

- A theoretical, intangible quality or train in which individuals differ - are theorized to have some form of independent existence and to exert broad but to some extent predictable influences on human behavior

Question 28

Construct Validity

Answer 28

Pertains to psychological tests that claim to measure complex, multifaceted, and theory-bound psychological attributes such as psychopathy, intel, leadership ability and the like “No criterion or universe of content is accepted as entirely adequate to define the quality to be measured” To evaluate this, we must amass a variety of evidence from numerous sources Refers to the appropriateness of these inferences about the underlying construct A test designed to measure this must estimate the existence of an inferred underlying characteristi (e.g., leadership ability) based on a limited sample of behavior.

Question 29

All Psychological constructs possess two characteristics in common

Answer 29

1. There is no single external referent sufficient to validate the existence of the construct; that is, the construct cannot be operationally defined E. A network of interlocking suppositions can be derived from existing theory about the construct

Question 30

Most studies of Construct Validity fall into one of the following categories

Answer 30

1. Analysis to determine whether the test items or sub tests are homogeneous and therefore measure a single construct 2. Study of developmental changes to determine whether they are consistent with the teeory of the construct 3. Research to ascertain whether group differences on test scores are theory-consistent 4. Analysis to determine whether intervention effects on test scores are theory-consistent 5. Correlation of the test with other related and unrelated tests and measures 6. Factor analysis of test scores in relation to other sources of information 7. Analysis to determine whether test scores allow for the correct classification of examinees

Question 31

Test Homogeniety

Answer 31

If a test measures a single construct, then its component items (or sub tests) likely will be homogeneous (also referred to as internally consistent).

Question 32

Homogeneous Scale

Answer 32

Method to achieve this is to correlate each potential item with the total score and select items that show high correlations with the total score. A related procedure is to correlate sub tests with the total score in the early phases of test development.

Question 33

Homogeneity

Answer 33

Is an important first step in certifying the construct validity of a new test, but standing alone it is weak evidence

Question 34

Social Interest Scale

Answer 34

Alfred Adler, Crandall (1984) defined: as an “interest in and concerns for others”

Question 35

Convergent Validity

Answer 35

Demonstrated when a test correlates highly with other variables or tests with which it shares an overlap of constructs

Question 36

Discriminant Validity

Answer 36

Demonstrated when a test does not correlate with variables or tests from which it should differ

Question 37

Multi trait-Multi method Matrix

Answer 37

Campbell and Fiske (1959) This calls for the assessment of two or more traits by two or mor methods Table 4.2 Can be a rich source of data on reliability, convergent validity and discriminant validity Full implementation of this procedure typically requires too monumental a commitment from researcher

Question 38

Factor Analysis

Answer 38

The purpose is to identify the minimum number of determiners (factors) required to account for the intercorrelations among a battery of tests. The goal is to find a smaller set of dimensions, called factors, that can account for the observed array of inter correlations among individual tests. A typical approach is to administer a battery of tests to several hundred subjects and then calculate a correlation matrix from the scores on all possible pairs of tests.

Question 39

Factor Loading

Answer 39

-Is actually a correlation between an individual test and a single factor. -Can vary between -1.0 and +1.0 -

Question 40

The final outcome of a Factor Analysis...

Answer 40

Is a table depicting the correlation of each test with each factor.

Question 41

Two Psychometric features

Answer 41

Sensitivity | Specificity

Question 42

Sensitivity

Answer 42

Has to do with accurate identification of patients who have a syndrome (e.g., demential)

Question 43

Specificity

Answer 43

Has to do with accurate identification of normal patients