Unit 5

• Coefficient Omega


  Estimate of internal reliability for a measure that is growing in popularity

  • Better than Cronbach's alpha
• Concurrent Validity


  A type of construct validity that examines whether the measure can predict a criterion measured at the same time, rather than in the future
• Construct Validity


  The degree a measurement accurately measures the theoretical construct it is designed to measure
• Content Validity


  A form of construct validity evaluated by comparing the content of the measure to the theoretical definition of the construct, making sure that all aspects of the construct are measured and no extraneous elements are also measured
• Convergent Validity


  An aspect of construct validity assessed by examining the extent to which scores on the measure are related to other measures of the same or similar constructs
• Cronbach's Alpha


  An indicator of internal consistency reliability by examining the average correlation of each item in a measure with every other question
• Discriminant Validity


  An aspect of construct validity in which scores on a measure are not related to scores on conceptually unrelated measures
• Face Validity


  The degree to which a measure appears to measure the indented variable
• Internal Consistency Reliability


  A form of reliability assessing the degree to which the item in a scale are consistent in measuring the same construct or variable
• Inter-rater Reliability


  An indicator or reliability that examines the degree to which two or more raters agree, having the same or similar judgment for a set of stimuli
• Interval Scale


  A scale of measurement where the intervals between numbers on the scale are all equal in size
• Measurement error


  Anything that contributes to the score on a measure that is not based on the variable of intrest
• Nominal scale


  A scale of measurement with two or more categories that have no numerical properties
• Ordinal Scale


  A scale of measurement in which the measurement categories from a rank order along continuum
• Pearson Correlation Coefficient


  A statistic indicating the strength of relationship between two variables, and weather the relationship is positive or negative
• Predictive Validity


  An aspect of construct validity that involves examining if a measure can predict a theoretically relevant future behaviour or criterion
• Ratio Scale


  A numerical scale of measurement, with equal intervals, that is a meaningful zero point, indicating total absence of the variables being measured
• Reactivity


  When the act of measuring or observing something changes it

  • Peoples behaviour changing when they know they are being watched
• Reliability


  The degree that a measure is consistent, providing a stable form of measurment
• Test-retest Reliability


  Administering the same measure on two different occasions, then calculating the correlation between the two different scores
• True Score


  A individuals actual level of the variable being measured

  • Not the same as the score they get on the test
• Split-half Reliability


  An assessment of internal consistency for a scale achieved by splitting a measure into two halves, that correlating performance on one half with performance on the other half
• Correlation coefficient


  A statistic that describes how strongly two variables are related to eachother
• Alternate forms reliability


  The consistency of test results between two tests that are different but equivalent
• Internal consistency reliability


  Determine the extent to which items in a test measure the same thing