What is Guttman split half reliability?

Asked By: Erinn Woodhall | Last Updated: 18th May, 2020
Category: education standardized testing
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Rulo/Guttman Split Half Reliability Coefficient is an adaption of the Spearman-Brown Coefficient, but one which does not require equal variances between the two split forms. Split-Half Reliability, which measure equivalence, is also called parallel form reliability or internal consistency reliability.

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Keeping this in view, what is a good split half reliability?

Split-half testing measures reliability. In split-half reliability, a test for a single knowledge area is split into two parts and then both parts given to one group of students at the same time. The scores from both parts of the test are correlated.

Subsequently, question is, what is a split half correlation? Noun. 1. split-half correlation - a correlation coefficient calculated between scores on two halves of a test; taken as an indication of the reliability of the test. chance-half correlation.

Herein, how do you use split half reliability?

To use split-half reliability, take a random sample of half of the items in the survey, administer the different halves to study participants, and run analyses between the two respective "split-halves." A Pearson's r or Spearman's rho correlation is run between the two halves of the instrument.

What are the 3 types of reliability?

Reliability. Reliability refers to the consistency of a measure. Psychologists consider three types of consistency: over time (test-retest reliability), across items (internal consistency), and across different researchers (inter-rater reliability).

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How do you measure split half reliability?

Split-half reliability is determined by dividing the total set of items (e.g., questions) relating to a construct of interest into halves (e.g., odd-numbered and even-numbered questions) and comparing the results obtained from the two subsets of items thus created.

What are the four types of reliability?

There are four main types of reliability. Each can be estimated by comparing different sets of results produced by the same method. The same test over time.

Table of contents
  • Test-retest reliability.
  • Interrater reliability.
  • Parallel forms reliability.
  • Internal consistency.
  • Which type of reliability applies to my research?

How is reliability measured?

Test-retest reliability is a measure of reliability obtained by administering the same test twice over a period of time to a group of individuals. The scores from Time 1 and Time 2 can then be correlated in order to evaluate the test for stability over time.

How do you determine reliability?

Correlate the test scores of the two administrations of the same test. – Parallel Forms Reliability: Determines how comparable are two different versions of the same measure. To calculate: Administer the two tests to the same participants within a short period of time. Correlate the test scores of the two tests.

What is the best definition of reliability?


Definition of reliability. 1 : the quality or state of being reliable. 2 : the extent to which an experiment, test, or measuring procedure yields the same results on repeated trials.

How do you test retest reliability?

In order to measure the test-retest reliability, we have to give the same test to the same test respondents on two separate occasions. We can refer to the first time the test is given as T1 and the second time that the test is given as T2. The scores on the two occasions are then correlated.

Why is reliability important?

Reliability is also an important component of a good psychological test. After all, a test would not be very valuable if it was inconsistent and produced different results every time. Reliability refers to the consistency of a measure. A test is considered reliable if we get the same result repeatedly.

What is reliability coefficient?

Definition of reliability coefficient. : a measure of the accuracy of a test or measuring instrument obtained by measuring the same individuals twice and computing the correlation of the two sets of measures.

What is parallel forms reliability?

Parallel forms reliability can help you test constructs. Parallel forms reliability (also called equivalent forms reliability) uses one set of questions divided into two equivalent sets (“forms”), where both sets contain questions that measure the same construct, knowledge or skill.

How can you improve reliability?


Here are six practical tips to help increase the reliability of your assessment:
  1. Use enough questions to assess competence.
  2. Have a consistent environment for participants.
  3. Ensure participants are familiar with the assessment user interface.
  4. If using human raters, train them well.
  5. Measure reliability.

How do you measure predictive validity?

Predictive Validity. Predictive validity involves testing a group of subjects for a certain construct, and then comparing them with results obtained at some point in the future.

What is split half reliability in psychology?

Split-Half Reliability. A measure of consistency where a test is split in two and the scores for each half of the test is compared with one another. This is not to be confused with validity where the experimenter is interested if the test measures what it is suppose to measure.

What is alternate reliability?

Alternate form reliability occurs when an individual participating in a research or testing scenario is given two different versions of the same test at different times. The scores are then compared to see if it is a reliable form of testing.

What does Cronbach's alpha mean?

Cronbach's alpha is a measure of internal consistency, that is, how closely related a set of items are as a group. It is considered to be a measure of scale reliability. Technically speaking, Cronbach's alpha is not a statistical test – it is a coefficient of reliability (or consistency).

What does Inter rater reliability mean?


Inter-Rater Reliability. Inter-Rater Reliability refers to statistical measurements that determine how similar the data collected by different raters are. A rater is someone who is scoring or measuring a performance, behavior, or skill in a human or animal.

How do you measure internal consistency?

Internal consistency is usually measured with Cronbach's alpha, a statistic calculated from the pairwise correlations between items. Internal consistency ranges between negative infinity and one. Coefficient alpha will be negative whenever there is greater within-subject variability than between-subject variability.

What is reliability in sociology?

Reliability is the degree to which a measurement instrument gives the same results each time that it is used, assuming that the underlying thing being measured does not change.