Reliability of selection measures l.jpg
This presentation is the property of its rightful owner.
Sponsored Links
1 / 13

Reliability of Selection Measures PowerPoint PPT Presentation


  • 127 Views
  • Uploaded on
  • Presentation posted in: General

Reliability of Selection Measures. Reliability Defined. The degree of dependability, consistency, or stability of scores on measures used in selection. Error of Measurement . Obtained Score True Score Error Score. Errors of Measurement.

Download Presentation

Reliability of Selection Measures

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Reliability of selection measures l.jpg

Reliability of Selection Measures


Reliability defined l.jpg

Reliability Defined

The degree of dependability,

consistency, or stability of

scores on measures used in

selection


Error of measurement l.jpg

Error of Measurement

Obtained Score

  • True Score

  • Error Score


Errors of measurement l.jpg

Errors of Measurement

-Physical characteristics = Higher reliability (HR)

-Psychological attributes = Lower reliability (LR)

==================================

  • Large amounts of measurement

    error = LR

  • Small amounts of measurement

    Error = HR


Methods of estimating reliability l.jpg

Methods of Estimating Reliability

  • Examines two sets of measure

  • If scores from the two measurements are similar, reliability will be raised

  • If scores from the two measurements are dissimilar, reliability will be lowered


Methods of estimating reliability6 l.jpg

Methods of Estimating Reliability

  • Statistical procedures calculated reliability coefficients range from 0.00 to 1.00

  • Higher the coefficient, the less the measurement error, and the higher the reliability estimate

  • Lower the coefficient, the higher the measurement error, and the lower the reliability estimate


Methods of estimating reliability7 l.jpg

Methods of Estimating Reliability

Selecting a method:

  • Dependability of data collected today be reflective of the same person in the future

  • To what degree do evaluations vary from one another

  • Accuracy of scores on measuring the true ability

  • Dependability of an assessment of a measure at a given moment


Methods of estimating reliability8 l.jpg

Methods of Estimating Reliability

Test-Retest

Same measure is used to

collect data from the same

person at two different times

  • The higher the coefficient, the greater the approximation to the true score: closer to 1.00

  • The lower the coefficient, the greater likelihood of error: closer to .00


Methods of estimating reliability9 l.jpg

Methods of Estimating Reliability

Test-Retest – Sources of error

  • Memory

  • Learning

  • “True change”


Methods of estimating reliability10 l.jpg

Methods of Estimating Reliability

Parallel or Equivalent Forms

Does not use the same measure

twice but will instead use

equivalent versions of the measure

  • Each has same number of

    questions

  • Each has same level of difficulty

  • Averages of scores are the same


Methods of estimating reliability11 l.jpg

Methods of Estimating Reliability

Internal Consistency Estimates

How similar are different parts of the measure (e.g. different questions on a test) in what they measure?

  • Split-half reliability

  • Kuder-Richardson Formula 20

  • Coefficient Alpha (α) – most commonly reported


Factors influencing the reliability of a measure l.jpg

Factors Influencing The Reliability of a Measure

  • Method of Estimating Reliability

  • Individual Differences Among Respondents

  • Length of a Measure

  • Test Question Difficulty

  • Administration of a measure


Standard error of measurement l.jpg

Standard Error of Measurement

Useful applications:

  • Forces us to think of scores on a measure not as exact points

  • Aid in decision making in which only one individual is involved

  • Determine the magnitude of how scores differ significantly from one another


  • Login