Kr20 kuder richardson formula 20 is an index of the internal consistency reliability of a measurement instrument, such as a test, questionnaire, or inventory. In other words, the reliability of any given measurement refers to the extent to which it is a consistent measure of a concept, and cronbachs alpha is. To investigate the effect of violating the assumption of equal item difficulty on kuder richardson kr formula 21 reliability coefficient, 670 eighthand ninth grade students were administered 26 short, homogeneous tests of mathematics concepts and skills. This program provides a complete framework into which users can place customized features and algorithms built using r. Rumus kuder richardson 20 apabila pada artikel sebelumnya kita sudah membahas cara perhitungan reliabilitas instrumen dengan excel yang meliputi uji cronbach alpha, split half dan spearman brown, maka dalam artikel ini kita akan membahas cara perhitungan rumus kr 20 dengan menggunakan 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. Additionally, of the 40 test items, we determined that.
Reliability coefficients lambda 1 through lambda 6. Th kuderrichardson formulas are used with dichotomous answers. I want to use the kr20 to learn about the internal consistency of items. Penjelasan uji reliabilitas instrumen lengkap uji statistik. There are two slightly different versions based on different statistical assumptions.
Essentially it lets you know whether the exam as a whole discriminated among students who mastered the subject matter and those who did not. How can reliability coefficient uding kr20 or kr21 be. Kuder richardson formula kr20 and the kuder richardson formula 21 kr21. Kr21 is a shortcut estimate of kr20 that was really meant for hand calculations. Results obtained by the kudar richardson formula 20 adapted for use with rkw scoring are compared with three other reliability formulas. Like kr20, kr 21 was first set forth as the twentyfirst formula discussed in kuder and richardson s 1937 paper.
Following the collaborative testing, the students completed a questionnaire that addressed their perceptions of collaborative examination. Stata module to calculate kuder richardson coefficient of reliability, statistical software components s351001, boston college department of economics, revised 14 sep 1999. Often discussed in tandem with kr20, is kuder richardson formula 21 kr 21. Pada bahasan kali ini kita tidak membahas lebih lanjut tentang rumus kr ini, karena akan dijelaskan pada postingan artikel berikutnya. Rumus uji reliabilitas teknik non belah dua non splithalf technique. Can spss calculate the kuderrichardson 20 kr20 and kr21 coefficients of reliability for a scale. Kr 21 is a simplified version of kr20, which can be used when the difficulty of all items on the test are known to be equal. Correlation between forms, guttman splithalf reliability, spearmanbrown reliability equal and unequal length, and coefficient alpha for each half. Dec 19, 2012 performing a reliability analysis on a measurement tool in which the items are dichotomous. Kuder richardson formula 20, or kr20, is a measure reliability for a test with binary variables i. Cronbachs alpha continuous and dichotomous data in spss. The kudar richardson 20 kr20 formula generates a raw reliability coefficient for survey items that use these response sets. Psychology definition of kuder richardson formulas. Can spss calculate the kuder richardson 20 kr20 and kr21 coefficients of reliability for a scale.
I know spss can do a chronbachs alpha, but ive never seen an option for the kr 21. Effect of collaborative testing on learning and retention. The kuderricharson formula 20, often abbreviated as kr20, and the kuderrichardson formula 21, abbreviated kr21, are measures of internal consistency for measures that feature dichotomous items. Kuderrichardson formula 20 21 correlation is determined from a single administration of a test through a. It is important to evaluate the process of learning. The most useful measure is generally the kuder richardson formula 20 kr20. Setelah dapat rumus lengkap dari kuder richardson 21 tersebut, gw kembali kebingungan buat caricari gimana cara mengolah rumus kuder richardson 21 ini dengan bantuan software spss 17 yang gw punya.
Effect of collaborative testing on learning and retention of course content in nursing students. Sebelum menginsal software ibm spss versi 21 pada laptop windows 7. This video demonstrates how to perform a kuderrichardson 20 kr20 test of internal consistency in spss. Kuder richardson formula 20 21 correlation is determined from a single administration of a test through a study of score variances 16. Kr21 typically underestimates the reliability of a test compared to. Korb university of jos reliability overview reliability is defined as the consistency of results from a test. The kr20, or kuderrichardson formula, measures overall test reliability. This video demonstrates how to perform a kuder richardson 20 kr20 test of internal consistency in spss. Sage reference reliability, kuderrichardson formulapage 1418. Pasw statistics is a tool that puts the power of advanced statistical analysis in your hands. Using reliability, validity, and item analysis to evaluate. The most useful measure is generally the kuderrichardson formula 20 kr20. The kr20 is used for items that have varying difficulty.
In psychometrics, cronbachs alpha coefficient of reliability in the special case of a scale with passfail, yesno, or other dichotomous test items. Differences between kuderrichardson formula 20 and formula. It is considered more accurate than the kuder richardson 21. Kr 21 analysis showed the test instrument was internally reliable. It is equivalent to performing the split half methodology on all combinations of questions and is applicable when each question is. Should i use kr20 or kr21 to calculate the reliability coefficient of a test. Rumus kr 20 dan tutorial cara hitung dengan excel uji. Differences between kuderrichardson formula 20 and.
Kuder richardson 21 calculator chisquare calculator. Kudar richardson 20 is run the exact same way as cronbachs alpha in spss and interpreted the same way as well. How can reliability coefficient uding kr20 or kr21 be determined using spss. Untuk itu, blog spss indonesia akan memberikan gambaran tentang cara install software ibm spss versi 21 pada laptop windows 7. May 25, 2012 dear all, i am checking how to do a kuderrichardson reliability coefficients kr20 in spss. An approximation to the sampling distribution of kuder richardson reliability formula 20 is derived, using its algebraic equivalent obtained through an itemsbysubjects analysis of variance. Performing a reliability analysis on a measurement tool in which the items are dichotomous. Kudarrichardson 20 cannot be used for response sets that have three or more levels. The reliability estimates are incorrect if you have missing data. The kr20, or kuder richardson formula, measures overall test reliability.
Kuder and richardson formula 20 the kuder and richardson formula 20 test checks the internal consistency of measurements with dichotomous choices. The kudarrichardson 20 kr20 formula generates a raw reliability coefficient for survey items that use these response sets. Internetbased software programs for students studying chisquare and. The kuder richardson 20 will always be greater or equal to the kuder richardson 21. Describes how to calculate the kuder and richardson formula 20 kr20. Kr20 kudarrichardson 20 professional statistician for hire. Should i use kr20 or kr21 to calculate the reliability. Item analysis technique to improve test items and instruction. How can reliability coefficient uding kr20 or kr21 be determined. As these are measures of internal consistency, they measure the extent to which all the items measure the same characteristic. Ranges from 01 the higher the better greater than 0.
What is the difference between kuderrichardson kr20 and cronbachs alpha and how do you formulate both. Kuderrichardson reliability coefficients kr20 and kr21. Kuderrichardson formula 20, or kr20, is a measure reliability for a test with binary variables i. Untuk perhitungan koefisien reliabilitas dapat dilakukan dengan menggunakan rumus kuder richardson kr20 dan kuder richardson kr 21. Although some recommend using the kr20 kuder richardson coefficient if the data are dichotomous, cronbachs coefficient alpha and kr20 yield the same value.
Where the questions in a test all have approximately the same difficulty i. An example of such a set of commands is provided below, however, kr20 is generally considered to be a better reliability estimate than kr21. Both kr formula 20 and kr formula 21 were used to estimate reliability on each test. Kuder richardson 20 kr20 scale reliability calculation can spss calculate the kr20 reliability figure for assessing scales that are composed of dichotomous items. The comprehensive test was piloted in one university in perak involving 16 music students. Computes the reliability coefficient of a set of dichotomous items, whereas cronbachs alpha is used for multipoint scales. What is the difference between kuderrichardson kr20 and. Analyzescalereliability, then specify the target items in the dialog. Can some one please tell me when i can use the kurder richardson 21 formula, kr20 coefficient alpha or spearman. Salah satu kelemahan perhitungan koefisien reliabilitas dengan menggunakan teknik belah dua adalah 1 banyaknya butir soal harus genap, dan 2 dapat dilakukan dengan cara yang berbeda sehingga menghasilkan nilai yang berbeda pula seperti terlihat pada contoh c.
Using and interpreting cronbachs alpha university of. May 01, 2015 to confirm the reliability of exam, we used kuder richardson formula 20 kr 20 and the reliability was found to be 0. The reliability procedure can calculate alpha and therefore can calculate kr20 for binary item variables. Spss viewer is an easy to use software tool with a friendly interface that alows you to view spss output navigator files created by spss version 15 or earlier. Kuder richardson 21 this statistic approximates interitem consistency. Item analysis with spss software linkedin slideshare. Instrument reliability educational research basics by. It assess the intern consistency reliability of a test of subtest made up of binary items, two psychometric methods, kuder richardson formula 20 9kr 20. The kuder richardson formula 21 as a splithalf coefficient, and some remarks on its basic assumption. Kuder richardson kr 21 formula, pvalue, pointbiserial correlation, and discrimination indices are utilized to evaluate and analyze results of the assessment. Kuder and richardson formula 20 real statistics using excel. Although some recommend using the kr20 kuder richardson.
Statistics that are reported by default include the number of cases, the number of items, and reliability estimates as follows. Rumus kr 20 dan tutorial cara hitung dengan excel uji statistik. For instance, the spss program can calculate kr20 as a special case of cronbachs alpha. Development tools downloads ibm spss statistics by ibm corp. Kuderrichardson 20 kr20 scale reliability calculation can spss calculate the kr20 reliability figure for assessing scales that are composed of dichotomous items. Analisis reliabilitas butir soal dengan metode kuder richardson kr20 adapun formula rumus kr 20 adalah. Kuderrichardson formula 21 calculation for test reliability. The scatter plot graph in figure 23 was generated with the spss statistical.
The theoretical distribution is compared to empirical estimates of the sampling distribution to assess how crucial certain assumptions are. Kuderrichardson reliability coefficients kr20 and kr21 ibm. The kr21 could be calculated in spss by using the aggregate procedure to save kr21 formula components to an active file, where they could be input into a compute command to calculate kr21. A generalization of kuderrichardson reliability formula 21. Ibm spss statistics is a program that allows you to identify your best customers, forecast future trends and perform advanced analysis. Analisis kuder richardson 20 atau sering dikenal dengan kr20 adalah analisis reliabilitas internal yang digunakan pada skor dikotomi. Reliability, kuderrichardson formulapage 1418 sage. Stata module to calculate kuderrichardson coefficient. Cronbachs alpha is a measure used to assess the reliability, or internal consistency, of a set of scale or test items. Beberapa ahli menyebut kr20 adalah bentuk spesial dari alpha cronbach. Dear all, i am checking how to do a kuderrichardson reliability coefficients kr20 in spss. Kuder richardson formula 20 21 correlation is determined from a single administration of a test through a study of score. Alpha should be calculated whenever possible, but kr21 can provide reasonable reliability estimates for tests with dichotomous items.
Although it can be applied to any test item responses that are dichotomously scored, it is most often used in classical psychometric analysis of psychoeducational tests and, as such. Consistency can be measured with splithalf testing and the kuder richardson test. Items on the instrument must be dichotomously scored 0 for incorrect and 1 for correct. I am having an issue with kr20 am using alpha on spss but i have read.
If you have more than 1 factor that is substantive, then you have a multidimensional construct. You can select various statistics that describe your scale and items. Based on parallel tests administered at the same sitting the kr 20 estimates are compared with alternateform correlations and with oddeven correlations adjusted by the spearmanbrown prophecy formula. The use of the theoretical distribution for testing hypotheses. Skor berkisar antara 0 1, dimana mendekati 1 asumsinya adalah reliable. Hi everybody, i need to calculate internal consistency reliability, using kuder richardson formula 20 i was wondering if someone can explain how to calculate it using spss 20. The difficulty index of 41 test items was computed using microsoft office excel. Oct 25, 2015 this video demonstrates how to perform a kuder richardson 20 kr20 test of internal consistency in spss. Consistency is a measure of reliability through similarity within the test, with individual questions giving predictable answers every time. The spss or any other statistical program should have the calculation of these reliability. A high value indicates a strong relationship between items and a lower value a weaker relationship. Eric ed074095 an assessment of the kuderrichardson.
Kudar richardson 20 cannot be used for response sets that have three or more levels. The kr20 is a special case of cronbachs alpha in which the items are binary variables usually scored as 0 or 1. Excel spreadsheet to calculate instrument reliability. Conducting a kuderrichardson 20 test kr20 in spss youtube. Sayangya software terbaru yakni ibm spss versi 21 ini tidak kompatibel dengan laptop atau pc jadul yang masih menggunkan vga dan prosesor yang rendah. Krl20 and kr 21 only work when data are entered as 0 and 1. Just copy and paste the below code to your webpage where you want to display this calculator. Estimates internal consistency reliability given the mean m, standard deviation sd and k the number of items from a specific measure of interest. Malangnya, pas gw ubekubek internet gw ga ketemu gimana cara mengolah rumus kuder richardson 21 ini dengan bantuan software spss 17.
Kuderrichardson 20 kr20 scale reliability calculation. Kuder richardson formula 20 kr 20 and kuder richardson formula 21 kr 21 these are alternative formulas for calculating how consistent subject responses are among the questions on an instrument. I use the kr20 instead of the cronbachs alpha because my items are noted on a binary scale. Kuderrichardson reliability coefficients kr20 in spss. Pdf determination of reliability and validity measures of a. Analisis reliabilitas butir soal dengan metode kuder. A collection of reliability measures was introduced by kuder and richardson, 1937. I have created an excel spreadsheet to automatically calculate splithalf reliability with spearmanbrown adjustment, kr20, kr 21, and cronbachs alpha.
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Is there a way to do it in spss, or should i bet looking towards a different application. Using reliability, validity, and item analysis to evaluate a. Online statistics helps you in estimating the test reliability using kuder richardson formula 21 calculator. This software is available to download from the publisher site. Can some one please tell me when i can use the kurderrichardson 21 formula, kr20. Faculty development programs improve the quality of multiple. For kr21 all you need is the mean score on the test, the standard deviation, and the number of items k. Effect of collaborative testing on learning and retention of.
Online statistics calculator which helps you in estimating test reliability from the given values. Calculating reliability of quantitative measures dr. Cara install software ibm spss versi 21 pada laptop spss. The aim of this study was to assess the utility of long term faculty development programs fdps in order to improve the quality of multiple choice questions mcqs items writing. 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. Spss software version 20 and its statistical interpretation. The approximate sampling distribution of kuderrichardson. The worlds leading statistical software for business, government, research and academic organizations. The kr20 is used to evaluate internal consistency among dichotomous variables.
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