pbsi 301

  1. Test-Retest Reliability: does a person receive the same score when they complete the measure at two different points in time

  2. Parallel Forms Reliability: are different versions of the same measures equivalent

Both test-retest and parallel forms can be measured using correlation. The closer the coefficient is to one, the more reliable the measure is

  1. Internal Consistency: do all items in a measure asses the same concept you are trying to measure. Is there strong correlation between individual items and total scores

    1. Cronbach's Alpha: a statistic that reflects the degree of internal consistency of items. Should always be from 0 to 1. The closer to 1 the better.

Inter-rater Reliability: does the measure produce the same results regardless of who is rating the scale. Can be evaluated by looking at correlation between raters.

  1. Content Validity: does the measure cover all facets of the construct we are trying to measure

  2. Criterion Validity: does the measure predict other indicators of the same construct

    1. Concurrent Validity: do the measures taken correlate with pre-existing measures that have already been validated

    2. Predictive Validity: the ability of the measure to predict outcomes in the future

  3. Construct Validity: is the measure related to thighs it shouldn't be and is it not related to things that it should. Does it measure the underlying concept you set out to measure? Requires psychological theory.

    1. Convergent Validity: does the measure relate to things that it should

    2. Discriminant Validity: does the measure not relate to things it shouldn’t