7/31/2019 Characteristics and Attributes of a Good Test

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7/31/2019 Characteristics and Attributes of a Good Test

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E- the error componentE is assumed to be randomly distributed and cannot be eliminated completely.

Types of Reliability:

Split-half reliability the scores on a randomly chosen half of the test items are correlated with scores

on the other half.

Testretest reliability scores on the test administered to the same persons are correlated with those

obtained on separate occasions.

Alternate-form reliability two forms of the test are administered and the correlations calculated.

Inter-rater reliability extent to which two independent raters scoring the test are correlated about

three months and the correlation coefficient computed.

It refers to what the test purports to measure and how well it measures the characteristic in question.

Types of validity:

Content validity the extent to which the test probes the domain adequately.

Construct validity the extent to which the test correlates with other tests measuring similar variables.

Divergent validity the extent to which the test successfully discriminates between related

constructs.

Convergent validity the degree to which the test is positively correlated with other tests measuring

the same variables.

Types of validity:Criterion validity the degree of correlation between the test and an external criterion.

Concurrent validity the test measure and the criterion are measured at the same time.

Predictive validity the criterion is measured after the test.

Face validity the degree to which the test appears to measure the variable.

Methods of data collection:

Source of data Method of collection Example

Behaviour observation Direct observation Strange situation and

coding procedure

Test procedures Tested with test material WAIS, matrix test

Questionnaires and Yesno items EPQ, MMPI

inventoriesRating scales Likert scales NEOP-R, attitude tests

Projective tests Interpretation of TAT, Rorschas

pictures or other stimuli

Types of Norms:

Percentile Ranks/Norms

Percentile rank represents the percentage of the norm group that earned a raw score

less than or equal to the score of that particular individual.

Age Norms

An age norm relates a level of test performance to the age of people who have taken

the test

Grade Norms

Another type of norm commonly used in school setting is called a grade norm.

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