In psychometrics, the kuderrichardson formula 20 kr20, first published in 1937, is a measure of internal consistency reliability for measures with dichotomous choices. Pasw statistics is a tool that puts the power of advanced statistical analysis in your hands. So, you can get what you need from the reliability procedure. Kuderrichardson reliability coefficients kr20 in spss. Kuder and richardson formula 20 real statistics using excel.
In addition, kr20 computes the item difficulty proportion of right answers, the average value of item difficulty, the item variance, the itemtest pointbiserial correlation coefficients, and the average value of itemtest correlation coefficients. Estimates internal consistency reliability given the mean m, standard deviation sd and k the number of items from a specific measure of interest. Kuderrichardson formula 20, or kr20, is a measure reliability for a test with binary. Universidad peruana cayetano heredia validez y confiabilidad mg. When a survey instrument has items that use dichotomous response sets yesno, then a special formula is required to establish reliability. Statistics that are reported by default include the number of cases, the number of items, and reliability estimates as follows. How to use spss kuderrichardson20 kr20 reliability.
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. Hi everybody, i need to calculate internal consistency reliability, using kuderrichardson formula 20 i was wondering if someone can explain how to calculate it using spss 20. Kuderrichardson 20 kr20 scale reliability calculation. I use the kr20 instead of the cronbachs alpha because my items are noted on a binary scale. Dec 19, 2012 how to use spss kuderrichardson20 kr20 reliability analysis. Can spss calculate the kuderrichardson 20 kr20 and kr21 coefficients of reliability for a scale. A pilot study was conducted to evaluate the relevance and understandability of the instrument the reliability of the instrument was evaluated with the kuderrichardson coefficient and the cronbach s alpha. Conducting a kuderrichardson 20 test kr20 in spss youtube. How can reliability coefficient uding kr20 or kr21 be determined. Both kr20 and cronbachs alpha are measures of internal consistency broadly referred to as coefficient alpha. Spss 20, version 20, v20 lizenzen, services, preise software.
The worlds leading statistical software for business, government, research and academic organizations. Kuderrichardson 20 kr20 scale reliability calculation can spss calculate the kr20 reliability figure for assessing scales that are composed of dichotomous items. Uji reliabilitas kuder richardson kr20 kr21 duration. Cronbachs alpha will generally increase as the intercorrelations among test items increase, and is thus known as an internal consistency estimate of reliability of test scores. Kudarrichardson 20 is run the exact same way as cronbachs alpha in spss and interpreted the same way as well. The kr20 is used to evaluate internal consistency among dichotomous variables. Kudarrichardson 20 cannot be used for response sets that have three or more levels. The kr20 is used for items that have varying difficulty. Because intercorrelations among test items are maximized when all items measure the same construct, cronbachs alpha is widely believed to indirectly indicate the. We interviewed 34 general practitioners 90% and 6 students 10% who had. Performing a reliability analysis on a measurement tool in which the items are dichotomous.
I have one question about using spss to calculate cronbachs alpha of a measure that draws on two types of items. Estos programas, escritos en lenguaje lispstat tierney, 1990, propor. The kudarrichardson 20 kr20 formula generates a raw reliability coefficient for survey items that use these response sets. Kuderrichardson reliability coefficients kr20 and kr21 ibm. The cronbach alpha coefficient is calculated, but if it is nominal data yes, no the statistical equivalent to the cronbach coefficient is the kr20 of kuderrichardson alfa model. Kuder richardson formula 20, or kr20, is a measure reliability for a test with binary variables i. The ordinal data are produced through 4point rating items and the dichotomous. Computes the reliability coefficient of a set of dichotomous items, whereas cronbachs alpha is used for multipoint scales. The kuder and richardson formula 20 test checks the internal consistency of measurements with dichotomous choices. Construct validity was performed by factorial analysis.
Dear all, i am checking how to do a kuderrichardson reliability coefficients kr20 in spss. You can select various statistics that describe your scale and items. The spss or any other statistical program should have the calculation of these reliability. How to do statistical analysis for test test reliability. What is the difference between kuderrichardson kr20 and.
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. Conducting a kuderrichardson 20 test kr20 in spss duration. This video demonstrates how to perform a kuderrichardson 20 kr20 test of internal consistency in spss. Ibm spss statistics is a program that allows you to identify your best customers, forecast future trends and perform advanced analysis.
Oct 25, 2015 this video demonstrates how to perform a kuderrichardson 20 kr20 test of internal consistency in spss. Kr21 is a simplified version of kr20, which can be used when the difficulty of all items on the test are known to be equal. How to use spss kuderrichardson20 kr20 reliability analysis. I want to use the kr20 to learn about the internal consistency of items. Th kuderrichardson formulas are used with dichotomous answers. Cronbachs alpha continuous and dichotomous data in spss. Kr20 is a special computational case of cronbachs alpha. The kudar richardson 20 kr20 formula generates a raw reliability coefficient for survey items that use these response sets.
609 497 1489 1164 779 102 1146 1278 1465 1341 484 329 231 759 1028 1243 210 60 727 497 930 923 724 677 1426 982 222 1487 870 352 649 40 1314 1091 6 309 29 490 836 1002 1481 903 937 1036 887