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Chapter 5 - Research
Measurement, reliability and validity
27
Psychology
Graduate
05/18/2012

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Term
nominal level of measurement
Definition
he scale that represents a hierarchy of precision on which a variable might be assessed.
Term
nominal
Definition
level of meauremet desribes variables that are categorized in nature and are different in quality rather then quantity.
Term
ordinal level of measurement
Definition
variables that can be ordered along some type of continuim
Term
The Interval Level of Measurement
Definition
variables that have equal intervals between them.
Term
ratio level of measurement
Definition
describes variables that have equal intervals between them but also has a posible value in zero
Term
continuous variable
Definition
one that can asume any value along some underlying continuim
Term
discrete or categorized variable
Definition
one with values that can be replaced only into categorizes that have definate boundaries
Term
reliability
Definition

when a test measures the same theing moe than once and results in the same outcomes

when we talk of reliability we talk of scores

Term
observed score
Definition

the score that you actually observe or record.

the number of correct words on a test.

any observant score consists of two components: true score and error score

Term
true score
Definition
the perfect reflection of the rue value of that variable
Term
error score
Definition
the factors that cause the true score and the observed score to differ
Term
method error
Definition
difference between true and observed scores resulting from the testing situation
Term
trait error
Definition
the reason for the difference  between the true and observed scores is a characteristic of the person taking the test.
Term
increasing reliability
Definition
pg 118
Term
correlation coefficient
Definition
used in the measurement of reliability
Term
reliable coefficients
Definition

range in value fom 21.00 to 11.00

roughly he same as correlation coefficient

Term
test retest reliability
Definition
a measure of how stable a test is over time
Term
parrell forms reliability
Definition

common form of reliability

different forms of the same test are give to the same groups of participants.

Term
inter related reliability
Definition
a measure of cosistecy from rater o rater, rather then from time to time
Term
Internal consistency
Definition
examines how unified the items are in a test
Term
Validity
Definition
the test or instrument that you are using actually measures what you need to have measured.
Term
content validity
Definition

the simpliest most straightforeward type of validity - indicates the extent to  which a est represents the universe of items from which is drawn

tests that sample a particular area of knowledge

Term
criterion validity
Definition
concerned with either how well a test estimaes present performance(concurrent validity) or how well it predicts performance (predictive validity)
Term
construct validity
Definition
is the extent to which the results of a test are related to a uderlying set of elated variables.
Term
multitrait multimethod matrix
Definition

measures various traits through various methods

reguardless of how you measure he tais, the scores are always related.

Term
convergeant validity
Definition
methods converge upon one another
Term
discriminant validity
Definition
method and trait variance are distinct from one another
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