Coun 203 Flashcards
Construct Validity
One of the three types of validity that is broader.
Construct validity is concerned with the extent to which the instrument measures some psychological trait or construct.
This type of validation involves the gradual accumulation of evidence.
Test-Retest Reliability
A method for determining the reliability of a test by administering it two or more times.
Nominal Scale
A scale of measurement characterized by assigning numbers to name or represent mutually exclusive groups (e.g., 1=male, 2=female)
Ordinal Scale
Type of measurement scale in which the degree of magnitude is indicated by the rank ordering the data.
Interval Scale
A type of measurement scale in which the units are in equal intervals.
Many of the statistics used to evaluate an instrument’s psychometric qualities require an interval scale.
Ratio Scale
A scale of measurement that has both interval data and a meaningful zero (e.g., weight, height).
Ratio scales have a meaningful zero, ratio interpretations can be made.
Measures of Central Tendency
Mean – average
Median – middle number
Mode – most frequently occurring number
Content-Related Validity
One of the three major categories of validity.
Focus is on whether the instrument’s content adequately represents the domain being assessed.
Evidence of content-related validity is particularly important in achievement tests.
Criterion-Related Validity
Instruments designed to compare an individual’s performance with a stated criterion or standard. Often, criterion referenced instruments provide information on specific knowledge or skills and on whether the individual has “mastered” that knowledge or skill. The focus is on what the person knows rather than how he or she compares with other people.
Norm-Referenced Instruments
Instruments in which the interpretation of performance is based on the comparison of an individual’s performance with that or a specified group of people
Mental Status Exam
Observed behaviors, affect, body language
Objective Assessment
Instruments that require little or no judgment on the part of the individual scoring the assessment.
A multiple-choice test with a fixed scoring key is an example of an objective assessment.
Projective Technique
A type of personality assessment that provides the client with a relatively ambitious stimulus.
The interpretation of a projective technique is subjective and requires extensive training in the technique.
MMPI
Minnesota Multiphasic Personality Inventory
Content-related test of personality
Achievement Test
Assessment in which the person has “achieved” either knowledge, information, or skills through instruction, training or experience.
Achievement tests measure acquired knowledge and do not make any predictions about the future.
Reliability
The degree to which a measure or a score is free of unsystematic error.
In classical test theory, reliability is the ratio of true variance to observed variance.