reliability coefficient pdf

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HANDOUT ON RELIABILITY

Reliability refers to the consistency and stability in the results of a test or scale A test is said to be reliable if it yields similar results in repeated administrations when the attribute being measured is believed not to have changed in the interval between measurements even though the test may be administered by different people and altern

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CRONBACH’S ALPHA 1

present paper explains the most frequently used reliability estimate coefficient alpha so that the coefficient\'s conceptual underpinnings will be understood Researchers need to understand score reliability because of the possible impact reliability has on the interpretation of research results

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Test Reliability—Basic Concepts

Suppose we have a holistically scored test and each response by a test taker is rated by two raters working independently In the group of all test takers • the interrater reliability coefficient is 82 and • the standard error of scoring as a percentage of the maximum possible score is 3 5

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Measurement Reliability

Types of Reliability Coefficients Test-Retest Inter-Rater Internal Consistency Correction for Attenuation Review Exercises What is reliability Consistency of measurement The extent to which a measurement instrument can differentiate among subjects Reliability is relative Facets of Reliability Mrs Z scores 20 at visit 1 and 25 at visit 2

What is reliability index?
Reliability index - defined as the correlation between true and observed scores on a single measure (i.e. XT) and is equivalent to x/ T. However, in reality, we rarely know about the true scores. Besides, the reliability coefficient defined above is purely a theoretical concept because it is not possible to verify that two tests are truly parallel.
Why do test takers have a higher reliability coefficient?
The more the test takers differ in their ability, the less likely that small changes in their scores will affect their relative positions in the group, and the higher the reliability coefficient will be. You cannot compare reliability coefficients for two different tests unless they refer to the same population of test takers.
What are the two most common reliability statistics?
The two most common reliability statistics are the reliability coefficient and the standard error of measurement. They can (and usually do) refer to the same sources of inconsistency in the scores, but they answer different questions about it. The reliability coefficient is an absolute number that can range from .00 to 1.00.
What is a reliability coefficient?
Reliability coefficient is an index of the amount of true variance operating in a set of raw test scores (Aron & Aron, 2003 ). The reliability coefficient is represented by the term r xx , the correlation of a test with itself. Reliability coefficients are variance estimates, meaning that the coefficient denotes the amount of true score variance.

HANDOUT ON RELIABILITY

Reliability refers to the consistency and stability in the results of a test or scale. A test is said to be reliable if it yields similar results in repeated administrations when the attribute being measured is believed not to have changed in the interval between measurements, even though the test may be administered by different people and altern

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However, in reality, we rarely know about the true scores. Besides, the reliability coefficient defined above is purely a theoretical concept because it is not possible to verify that two tests are truly parallel. Therefore reliability of tests have to be estimated using other methods. web.wlu.ca

Methods of Estimating Reliability:

The methods of estimating reliability can be roughly categorized into two groups: one group of methods includes methods that require two separate test administrations; and another group of methods includes those using one test administration. 1. Methods Requiring Two Separate Test Administrations: web.wlu.ca

b. Alternate-Forms Method -

This method involves constructing two similar forms of a test/scale (i.e. both forms have the same content) and administering both forms to the same group of examinees within a very short time period. The correlation between observed scores on the alternate test/scale forms, (i.e. mxy computed using the Pearson product moment formula), is n estim

2. Methods Using One Test Administration:

There are many situations when a single form of a test/scale will be administered only once to a group of examinees/subjects. The following are methods of estimating reliability based on scores from a single test administration. These methods of estimating reliability are mainly focused on how consistently the examinees/subjects performed or scor

b. Split-Half Method -

Under this method, test/scale developers divide the scale/test into two halves, so that the first half forms the first part of the entire test/scale and the second half forms the remaining part of the test/scale. Both halves are normally of equal lengths and they are designed in such a way that each is an alternate form of the other. Estimation o

c. Even/Odd Method -

Even/odd method is similar to split-half method, with the exception that the estimation of reliability for the entire test/scale is no longer based on correlating the first half of the test/scale with the second half, but instead it is based on correlating even items with odd items. web.wlu.ca

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variables=item1 to item6/ scale (test score) =item1 item3 item5 item2 item4 item6/ model=split

Since “EVEN/ODD” model for reliability analysis is not an available option in SPSS, the “SPLIT-HALF” model is used for this analysis. However, in order that the “SPLIT-HALF” model can be successfully employed for estimating even/odd reliability, the order of the items listed in the preceding “scale” subcommand must have been arranged in such a way

5.2 Conducting the Split-Half Reliability Analysis

Please note that the steps necessary for conducting the Split-Half reliability analysis are almost identical to the procedures outlined above for the Cronbach Alpha analysis. The only difference when using SPSS for Windows is that you must specify the “Split-Half” model instead of the “Alpha” model in the Reliability Analysis dialog box. Therefo

1.2 Conducting the Even-Odd Reliability Analysis

Unlike the Cronbach Alpha and Split-Half models, the Even-Odd method of assessing reliability cannot be accessed using the “point and click” approach in SPSS. In order to utilize the Even-Odd option, one needs to modify the syntax file for the Split-Half model. More specifically, the order of the items examined needs to be changed so that the odd

PDF	Test Reliability—Basic Concepts reliability internal consistency

PDF	Reliability Coefficient is the Same for - Two Measurement Procedures hypothesis that the intraclass reliability coefficients The intraclass correlation is a reliability coefficient with a broad range of applications.

PDF	STATISTICAL ANALYSIS: INTERNAL-CONSISTENCY RELIABILITY The correlation coefficient (r) between the two sets of values designates the degree of reliability. For perceptive field tests correlations more than or equal

PDF	Measuring the Validity and Reliability of Research Instruments Reliability means that the scores of an instrument are stable and explained with Kuder-Richardson (KR-20) and coefficient alpha (Cronbach 1984) values.

PDF	How Reliable are Measurement Scales? External Factors with (AERA 1999; Cronbach 1951; Hulin

PDF	Two Criteria for Good Measurements in Research: Validity and Dec 24 2017 discuss the validity and reliability of measurement instruments that ... Test-retest reliability: The reliability coefficient is obtained by ...

PDF	HANDOUT ON RELIABILITY Reliability refers to the consistency and Items 1 - 6 reliability coefficient and the reliability index are derived from the model. 2. According to classical true score theory two measures/tests are ...

PDF	Calculating Reliability of Quantitative Measures To calculate: Administer one test once and then calculate the reliability index by coefficient alpha Kuder-Richardson formula 20 (KR-20) or the Spearman-

PDF	An Instructors Guide to Understanding Test Reliability Craig S For a classroom exam it is desirable to have a reliability coefficient of .70 or higher. High reliability coefficients are required for standardized tests

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PDF	Validity and Reliability - Charles Dennis Hale Items 31 - 36 · The test is given two weeks later with a reliability coefficient of r = 0 70, giving evidence of consistency (i e , stability) b Parallel forms reliability (also