**SAGE Reference Spearman-Brown Prophecy Formula**

Psychology Definition of SPEARMAN-BROWN PROPHECY FORMULA: Mathematical formula. It concerns the length of a test and its reliability. An increase in items will increase reliability. [Charles dward Spearman (1863-1... ## Split-half reliability (adjusted using the Spearman–Brown prophecy formula) There are times when we can't calculate internal consistency using item responses. For example, I often work with a decision-making variable called recklessness.

**Spearman–Brown Prophecy Formula SAGE Research Methods**

Spearman Brown Prophecy Formula - when the "correction factor" (N) is set at "2," it corrects the split half reliability coefficient. Corrected roe = (2) (r) / 1 + (2 - 1) (r) B. Guttman Formula - Use of Pearson's r for split half reliability assumes the variances of the two halves are about equal. If not, do not use. The Guttman formula can be used instead. Guttman roe = 2[1 - ( O2 - E2) / X2... The Spearman-Brown Prediction Formula To adjust for this, psychometricians use the Spearman-Brown prophecy formula. It takes the split half correlation as input and converts it to an estimate of the equivalent level of reliability for the full length test.

**Spearman–Brown prediction formula Wiki Everipedia**

To be sure, the Spearman-Brown formula is usually derived under the assumption that we have parallel items, which implies (among other things) that the items have equal difficulty. But it turns out this assumption isn't necessary; it can be relaxed to allow unequal difficulties, and the Spearman-Brown formula will still hold. I demonstrate this below.... Psychology Definition of SPEARMAN-BROWN PROPHECY FORMULA: Mathematical formula. It concerns the length of a test and its reliability. An increase in items will increase reliability. [Charles dward Spearman (1863-1

**The Applicability of the Spearman-Brown Prophecy Formula**

Spearman-Brown’s Predicted Reliability The Spearman-Brown correction is a specific form of the Spearman-Brown predicted reliability formula. Suppose we have a test with reliability ρ .... Additionally the program will estimate the reliability of an average of a number of ratings for each subject via the Spearman-Brown prophecy formula. Conclusion This simple web-based program provides a convenient means of estimating the reliability of rating data without the need to conduct special studies in order to provide complete rating data.

## How To Use Spearman Brown Prophecy Formula

### Spearman-Brown prophecy formula psychological testing

- The Applicability of the Spearman-Brown Prophecy Formula
- TalkSpearman–Brown prediction formula Wikipedia
- A SIMPLE PROOF OF THE SPEARMAN-BROWN FORMULA
- TalkSpearman–Brown prediction formula Wikipedia

## How To Use Spearman Brown Prophecy Formula

### 1/01/2016 · This video demonstrates how to compute split-half reliability and the Spearman-Brown Coefficient using SPSS. The Spearman-Brown Coefficient is a measure of inter-item reliability.

- Because the subsets had different lengths (one, two, three, four, five, or six passages with 8, 16, 24, 32, 40, or 48 items, respectively), we used the Spearman-Brown prophecy formula to adjust
- Test Length The Spearman-Brown prophecy formula is most associated with split-half reliability but can actually be used whenever a test developer wants to estimate the effects of lengthening or shortening a test on its reliability coefficient. For instance, if a 100-item test has a reliability coefficient of .84, the Spearman-Brown formula could be used to estimate the effects of increasing
- nrater= For use in Spearman-Brown Prophecy formula to estimate the reliability of the mean of nrater ratings, where nrater is different than the number of raters actually used in the data. Default is 0, which omits this computation. out= Name of output data set to contain the statistics. Default is _DATA_. print= 0 for no printout, 1 to print the intraclass correlations and related statistics
- of Spearman's for finding the correlation between the sums or averages of scores. 2 This revised formula is now in current use and is known as the Spearman-Brown prediction formula.

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