Often discussed in tandem with kr20, is kuder richardson formula 21 kr21. Construct validity was performed by factorial analysis. Estimates internal consistency reliability given the mean m, standard deviation sd and k the number of items from a specific measure of interest. Spss 20, version 20, v20 lizenzen, services, preise software. In psychometrics, the kuderrichardson formula 20 kr20, first published in 1937, is a measure of internal consistency reliability for measures with dichotomous choices. The name of this formula stems from the fact that is the twentieth formula discussed in kuder and richardsons seminal paper on test reliability. How to do statistical analysis for test test reliability.
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. The kudar richardson 20 kr20 formula generates a raw reliability coefficient for survey items that use these response sets. Ibm spss statistics is a program that allows you to identify your best customers, forecast future trends and perform advanced analysis. The kuder and richardson formula 20 test checks the internal consistency of measurements with dichotomous choices.
I want to use the kr20 to learn about the internal consistency of items. This video demonstrates how to perform a kuderrichardson 20 kr20 test of internal consistency in spss. 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. 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. The kudarrichardson 20 kr20 formula generates a raw reliability coefficient for survey items that use these response sets. Dear all, i am checking how to do a kuderrichardson reliability coefficients kr20 in spss.
I use the kr20 instead of the cronbachs alpha because my items are noted on a binary scale. The spss or any other statistical program should have the calculation of these reliability. Oct 25, 2015 this video demonstrates how to perform a kuderrichardson 20 kr20 test of internal consistency in spss. Universidad peruana cayetano heredia validez y confiabilidad mg. Uji reliabilitas kuder richardson kr20 kr21 duration. Cronbachs alpha continuous and dichotomous data in spss. Kuderrichardson reliability coefficients kr20 and kr21 ibm. The kr20 is used for items that have varying difficulty. So, you can get what you need from the reliability procedure.
Kuderrichardson reliability coefficients kr20 in spss. 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. Pasw statistics is a tool that puts the power of advanced statistical analysis in your hands. Kr20 is a special computational case of cronbachs alpha. Kuderrichardson 20 kr20 scale reliability calculation. The worlds leading statistical software for business, government, research and academic organizations. Conducting a kuderrichardson 20 test kr20 in spss duration. Conducting a kuderrichardson 20 test kr20 in spss youtube. Dec 19, 2012 how to use spss kuderrichardson20 kr20 reliability analysis. May 25, 2012 dear all, i am checking how to do a kuderrichardson reliability coefficients kr20 in spss. Can spss calculate the kuderrichardson 20 kr20 and kr21 coefficients of reliability for a scale. Kuderrichardson 20 kr20 scale reliability calculation can spss calculate the kr20 reliability figure for assessing scales that are composed of dichotomous items. When a survey instrument has items that use dichotomous response sets yesno, then a special formula is required to establish reliability.
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. Computes the reliability coefficient of a set of dichotomous items, whereas cronbachs alpha is used for multipoint scales. Both kr20 and cronbachs alpha are measures of internal consistency broadly referred to as coefficient alpha. You can select various statistics that describe your scale and items. Kuderrichardson formula 20, or kr20, is a measure reliability for a test with binary. 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. The ordinal data are produced through 4point rating items and the dichotomous. How can reliability coefficient uding kr20 or kr21 be determined. What is the difference between kuderrichardson kr20 and. Estos programas, escritos en lenguaje lispstat tierney, 1990, propor. The kr20 is used to evaluate internal consistency among dichotomous variables. 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. Statistics that are reported by default include the number of cases, the number of items, and reliability estimates as follows. 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.
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