View Here : Kuder Richardson Formula 21
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.
Formula: Online statistics helps you in estimating the test reliability using Kuder-Richardson Formula 21 calculator. Where, k - Number of questions μ - Population mean score σ 2 - Variance of the total scores of all the people ρKR21 - Reliability of the test
Kuder and Richardson Formula 20. The Kuder and Richardson Formula 20 test checks the internal consistency of measurements with dichotomous choices. It is equivalent to performing the split half methodology on all combinations of questions and is applicable when each question is either right or wrong.
In psychometrics, the Kuder–Richardson Formula 20 (KR-20), first published in 1937, is a measure of internal consistency reliability for measures with dichotomous choices. It is a special case of Cronbach's α, computed for dichotomous scores.
Lenke, Joanne M.; And Others. To investigate the effect of violating the assumption of equal item difficulty on Kuder-Richardson (KR) Formula 21 reliability coefficient, 670 eighth-and ninth- grade students were administered 26 short, homogeneous "tests" of mathematics concepts and skills.
Formula: Online statistics helps you in estimating the test reliability using Kuder-Richardson Formula 21 calculator. Where, k - Number of questions μ - Population mean score σ 2 - Variance of the total scores of all the people ρKR21 - Reliability of the test Related Calculator:
formula with cell references. In article . com, wrote: Good Morning! I am trying to figure out how to adapt the Kruder-Richardson Formula #21 to excel. First of all this is not a homework assignment. Secondly, I appologize for linking a file but I could not get the fonts for the formula right. What the formla does is to estimate test reliability.
A Generalization of Kuder-Richardson Reliability Formula 21 SAGE Publications, Inc.1960DOI: 10.1177/001316446002000114 HaroldWebster The Center for the Study of Higher Education University of California, Berkeley EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT VOL. XX, No. 1, 1960 THERE is a growing trend ...
Estimates Internal Consistency Reliability given the Mean (M), Standard Deviation (SD) and k (the number of items) from a specific measure of interest.
KR-21 coefficients were calculated for the entire assessment instrument resulting in a coefficient of 0.9415. For teacher made test assessments, this number is high. We would expect to see this high level of reliability in high-stakes tests.