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What is the Kuder Richardson estimate of reliability?

by Rhyley Bryan

What is the Kuder Richardson estimate of reliability?

Kuder-Richardson Formula 20, or KR-20, is a measure reliability for a test with binary variables (i.e. answers that are right or wrong). Reliability refers to how consistent the results from the test are, or how well the test is actually measuring what you want it to measure.

How do you find the reliability coefficient?

To Find, Reliability Coefficient, follow the steps as following:

  1. Give us a chance to first figure the average score of the persons and their tasks.
  2. Next, figure the variance for:
  3. Presently, figure the individual variance of P0-T0 and P1-T0, P0-T1 and P1-T1, P0-T2 and P1-T2.
  4. Compute the Total change.

How do you calculate KR 21?

The formula for KR21 for scale score X is K/(K-1) * (1 – U*(K-U)/(K*V)) , where K is the number of items,U is the mean of X and V is the variance of X.

How to calculate the Kuder and Richardson Formula 21?

Describes how to calculate the Kuder and Richardson Formula 20 (KR20) and Kuder and Richardson Formula 21 (KR21) measures of reliability in Excel. Skip to content Real Statistics Using Excel Menu Menu Home Free Download Resource Pack Examples Workbooks Donation (Optional)

When to use the Kuder-Richardson reliability estimate?

The use of the Kuder-Richardson reliability estimates requires only the administra­ tion of a single test and ‘does away with any biases (5hat might arise when a test is split any,one of a number of ways, as in the split-half method.

When to use Kuder Richardson or Cronbach Alpha?

Although the Kuder-Richardson formulas are applicable only when test items are scored “0” (wrong) or “1” (right), Cronbach’s alpha is a general formula for estimating the reliability of a test consisting of items on which two or more scoring weights are assigned to answers.

How is the reliability coefficient of KR20 computed?

The following commands run the Reliability procedure to produce the KR20 coefficient as Cronbach’s Alpha. ScoreA is computed for cases with full data on the six items. The Aggregate procedure is used to compute the pieces of the KR21 formula and save them in a new data set, (kr21_info).