Analisis reliabilitas butir soal dengan metode kuder. For instance, the spss program can calculate kr20 as a special case of cronbachs alpha. Kudarrichardson 20 cannot be used for response sets that have three or more levels. Performing a reliability analysis on a measurement tool in which the items are dichotomous. Using reliability, validity, and item analysis to evaluate. I use the kr20 instead of the cronbachs alpha because my items are noted on a binary scale. In psychometrics, cronbachs alpha coefficient of reliability in the special case of a scale with passfail, yesno, or other dichotomous test items.
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. Kuderrichardson formula 20, or kr20, is a measure reliability for a test with binary variables i. The most useful measure is generally the kuder richardson formula 20 kr20. What is the difference between kuderrichardson kr20 and. Cronbachs alpha continuous and dichotomous data in spss. 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. 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. Effect of collaborative testing on learning and retention. Kr21 is a shortcut estimate of kr20 that was really meant for hand calculations.
Calculating reliability of quantitative measures dr. Internetbased software programs for students studying chisquare and. Pasw statistics is a tool that puts the power of advanced statistical analysis in your hands. Kuderrichardson formula 21 calculation for test reliability. Ranges from 01 the higher the better greater than 0. A collection of reliability measures was introduced by kuder and richardson, 1937. Kuder richardson formula 20 21 correlation is determined from a single administration of a test through a study of score variances 16. Sebelum menginsal software ibm spss versi 21 pada laptop windows 7. Pada bahasan kali ini kita tidak membahas lebih lanjut tentang rumus kr ini, karena akan dijelaskan pada postingan artikel berikutnya.
I have created an excel spreadsheet to automatically calculate splithalf reliability with spearmanbrown adjustment, kr20, kr 21, and cronbachs alpha. Instrument reliability educational research basics by. Korb university of jos reliability overview reliability is defined as the consistency of results from a test. Results obtained by the kudar richardson formula 20 adapted for use with rkw scoring are compared with three other reliability formulas. Kuder and richardson formula 20 real statistics using excel. 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. Kuder and richardson formula 20 the kuder and richardson formula 20 test checks the internal consistency of measurements with dichotomous choices. Untuk perhitungan koefisien reliabilitas dapat dilakukan dengan menggunakan rumus kuder richardson kr20 dan kuder richardson kr 21. Effect of collaborative testing on learning and retention of course content in nursing students. How to use spss kuderrichardson20 kr20 reliability. The kr20 is used for items that have varying difficulty. Effect of collaborative testing on learning and retention of. The kr20 is used to evaluate internal consistency among dichotomous variables. The scatter plot graph in figure 23 was generated with the spss statistical.
Krl20 and kr 21 only work when data are entered as 0 and 1. Should i use kr20 or kr21 to calculate the reliability. Kuderrichardson reliability coefficients kr20 and kr21 ibm. There are two slightly different versions based on different statistical assumptions.
Online statistics calculator which helps you in estimating test reliability from the given values. This video demonstrates how to perform a kuderrichardson 20 kr20 test of internal consistency in spss. Item analysis technique to improve test items and instruction. Items on the instrument must be dichotomously scored 0 for incorrect and 1 for correct. Dear all, i am checking how to do a kuderrichardson reliability coefficients kr20 in spss. Reliability, kuderrichardson formulapage 1418 sage. How can reliability coefficient uding kr20 or kr21 be. Differences between kuderrichardson formula 20 and formula. Kuder richardson 21 this statistic approximates interitem consistency. 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. The most useful measure is generally the kuderrichardson formula 20 kr20. Although some recommend using the kr20 kuder richardson. 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. 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.
Estimates internal consistency reliability given the mean m, standard deviation sd and k the number of items from a specific measure of interest. It is considered more accurate than the kuder richardson 21. Sayangya software terbaru yakni ibm spss versi 21 ini tidak kompatibel dengan laptop atau pc jadul yang masih menggunkan vga dan prosesor yang rendah. Kr21 typically underestimates the reliability of a test compared to. Dec 19, 2012 performing a reliability analysis on a measurement tool in which the items are dichotomous. The reliability procedure can calculate alpha and therefore can calculate kr20 for binary item variables. Stata module to calculate kuder richardson coefficient of reliability, statistical software components s351001, boston college department of economics, revised 14 sep 1999.
Is there a way to do it in spss, or should i bet looking towards a different application. I want to use the kr20 to learn about the internal consistency of items. I am having an issue with kr20 am using alpha on spss but i have read. The difficulty index of 41 test items was computed using microsoft office excel. Sage reference reliability, kuderrichardson formulapage 1418. Both kr formula 20 and kr formula 21 were used to estimate reliability on each test. What is the difference between kuderrichardson kr20 and cronbachs alpha and how do you formulate both. Kudar richardson 20 is run the exact same way as cronbachs alpha in spss and interpreted the same way as well. Kuder richardson 21 calculator chisquare calculator. Analisis kuder richardson 20 atau sering dikenal dengan kr20 adalah analisis reliabilitas internal yang digunakan pada skor dikotomi. Alpha should be calculated whenever possible, but kr21 can provide reasonable reliability estimates for tests with dichotomous items.
For kr21 all you need is the mean score on the test, the standard deviation, and the number of items k. 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. The use of the theoretical distribution for testing hypotheses. Kr20 kuder richardson formula 20 is an index of the internal consistency reliability of a measurement instrument, such as a test, questionnaire, or inventory.
The spss or any other statistical program should have the calculation of these reliability. 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. Differences between kuderrichardson formula 20 and. Reliability coefficients lambda 1 through lambda 6. The reliability estimates are incorrect if you have missing data. How can reliability coefficient uding kr20 or kr21 be determined using spss. Where the questions in a test all have approximately the same difficulty i. 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. Ibm spss statistics is a program that allows you to identify your best customers, forecast future trends and perform advanced analysis. The kr20 is a special case of cronbachs alpha in which the items are binary variables usually scored as 0 or 1.
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. 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. Should i use kr20 or kr21 to calculate the reliability coefficient of a test. Following the collaborative testing, the students completed a questionnaire that addressed their perceptions of collaborative examination. How can reliability coefficient uding kr20 or kr21 be determined. Using reliability, validity, and item analysis to evaluate a.
Online statistics helps you in estimating the test reliability using kuder richardson formula 21 calculator. The kr20, or kuderrichardson formula, measures overall test reliability. Kudar richardson 20 cannot be used for response sets that have three or more levels. May 25, 2012 dear all, i am checking how to do a kuderrichardson reliability coefficients kr20 in spss. Can some one please tell me when i can use the kurder richardson 21 formula, kr20 coefficient alpha or spearman. Often discussed in tandem with kr20, is kuder richardson formula 21 kr 21. Excel spreadsheet to calculate instrument reliability. Kuderrichardson reliability coefficients kr20 and kr21. Kr 21 analysis showed the test instrument was internally reliable.
Can some one please tell me when i can use the kurderrichardson 21 formula, 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. The kr20, or kuder richardson formula, measures overall test reliability. This program provides a complete framework into which users can place customized features and algorithms built using r. The kuder richardson formula 21 as a splithalf coefficient, and some remarks on its basic assumption. Kuder richardson formula kr20 and the kuder richardson formula 21 kr21. Just copy and paste the below code to your webpage where you want to display this calculator. Development tools downloads ibm spss statistics by ibm corp. The kuder richardson 20 will always be greater or equal to the kuder richardson 21.
Oct 25, 2015 this video demonstrates how to perform a kuder richardson 20 kr20 test of internal consistency in spss. Rumus kr 20 dan tutorial cara hitung dengan excel uji. Consistency can be measured with splithalf testing and the kuder richardson test. Describes how to calculate the kuder and richardson formula 20 kr20. Cronbachs alpha is a measure used to assess the reliability, or internal consistency, of a set of scale or test items. Faculty development programs improve the quality of multiple. The kudarrichardson 20 kr20 formula generates a raw reliability coefficient for survey items that use these response sets. This software is available to download from the publisher site. Using and interpreting cronbachs alpha university of.
Kudarrichardson 20 is run the exact same way as cronbachs alpha in spss and interpreted the same way as well. Rumus uji reliabilitas teknik non belah dua non splithalf technique. Analyzescalereliability, then specify the target items in the dialog. Penjelasan uji reliabilitas instrumen lengkap uji statistik. A high value indicates a strong relationship between items and a lower value a weaker relationship. Additionally, of the 40 test items, we determined that. Skor berkisar antara 0 1, dimana mendekati 1 asumsinya adalah reliable.
Beberapa ahli menyebut kr20 adalah bentuk spesial dari alpha cronbach. It is important to evaluate the process of learning. As these are measures of internal consistency, they measure the extent to which all the items measure the same characteristic. The comprehensive test was piloted in one university in perak involving 16 music students. Consistency is a measure of reliability through similarity within the test, with individual questions giving predictable answers every time. 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. An example of such a set of commands is provided below, however, kr20 is generally considered to be a better reliability estimate than kr21. This video demonstrates how to perform a kuder richardson 20 kr20 test of internal consistency in spss. Statistics that are reported by default include the number of cases, the number of items, and reliability estimates as follows.
Kuderrichardson reliability coefficients kr20 in spss. Can spss calculate the kuder richardson 20 kr20 and kr21 coefficients of reliability for a scale. Pdf determination of reliability and validity measures of a. Kuderrichardson formula 20 21 correlation is determined from a single administration of a test through a. Malangnya, pas gw ubekubek internet gw ga ketemu gimana cara mengolah rumus kuder richardson 21 ini dengan bantuan software spss 17. Cara install software ibm spss versi 21 pada laptop spss. A generalization of kuderrichardson reliability formula 21. If you have more than 1 factor that is substantive, then you have a multidimensional construct. Correlation between forms, guttman splithalf reliability, spearmanbrown reliability equal and unequal length, and coefficient alpha for each half.
The approximate sampling distribution of kuderrichardson. Essentially it lets you know whether the exam as a whole discriminated among students who mastered the subject matter and those who did not. You can select various statistics that describe your scale and items. Th kuderrichardson formulas are used with dichotomous answers.
Analisis reliabilitas butir soal dengan metode kuder richardson kr20 adapun formula rumus kr 20 adalah. It is equivalent to performing the split half methodology on all combinations of questions and is applicable when each question is. 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. Kuderrichardson 20 kr20 scale reliability calculation can spss calculate the kr20 reliability figure for assessing scales that are composed of dichotomous items. The kudar richardson 20 kr20 formula generates a raw reliability coefficient for survey items that use these response sets. Spss software version 20 and its statistical interpretation. 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. Kuder richardson formula 20, or kr20, is a measure reliability for a test with binary variables i.
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. I know spss can do a chronbachs alpha, but ive never seen an option for the kr 21. Conducting a kuderrichardson 20 test kr20 in spss youtube. Kuder richardson 20 kr20 scale reliability calculation can spss calculate the kr20 reliability figure for assessing scales that are composed of dichotomous items. Psychology definition of kuder richardson formulas. Although some recommend using the kr20 kuder richardson coefficient if the data are dichotomous, cronbachs coefficient alpha and kr20 yield the same value. Can spss calculate the kuderrichardson 20 kr20 and kr21 coefficients of reliability for a scale. Rumus kr 20 dan tutorial cara hitung dengan excel uji statistik.
As this can quickly get tedious for tests with a large amount of items, its usually calculated with some type of software like excel. Eric ed074095 an assessment of the kuderrichardson. Computes the reliability coefficient of a set of dichotomous items, whereas cronbachs alpha is used for multipoint scales. The theoretical distribution is compared to empirical estimates of the sampling distribution to assess how crucial certain assumptions are. Kuder richardson formula 20 21 correlation is determined from a single administration of a test through a study of score. Untuk itu, blog spss indonesia akan memberikan gambaran tentang cara install software ibm spss versi 21 pada laptop windows 7. 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. Kr20 kudarrichardson 20 professional statistician for hire. Like kr20, kr 21 was first set forth as the twentyfirst formula discussed in kuder and richardson s 1937 paper. Stata module to calculate kuderrichardson coefficient. The worlds leading statistical software for business, government, research and academic organizations. 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. Kuder richardson kr 21 formula, pvalue, pointbiserial correlation, and discrimination indices are utilized to evaluate and analyze results of the assessment.
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