Differences
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calculations [2017/01/10 15:06] steveclarke |
calculations [2017/01/10 15:21] (current) steveclarke [Scaled Scoring] |
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| ==== Scaled Scoring ==== | ==== Scaled Scoring ==== | ||
| Item Writing tracks two types of Candidate scores: raw scores and scaled scores. A raw score is a score without any sort of adjustment or transformation, such as the simple number of Items answered correctly. A scaled score is the results of some transformation applied to the raw score. The purpose of scaled scores is to report scores for all Candidates on a consistent scale. | Item Writing tracks two types of Candidate scores: raw scores and scaled scores. A raw score is a score without any sort of adjustment or transformation, such as the simple number of Items answered correctly. A scaled score is the results of some transformation applied to the raw score. The purpose of scaled scores is to report scores for all Candidates on a consistent scale. | ||
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| + | Th scaled score is calculated using two different formulas based on the raw score. One formula is used if the Candidate is at or above the raw cut score. The other formula is used if the Candidate raw score is blow the raw cut score. | ||
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| + | ** At or Above Raw Cut Score** | ||
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| + | (CandidateRaw - RawCut) * ( (ScaledMax - ScaledCut) / (RawMax - RawCut) ) + ScaledCut | ||
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| + | ** Below Raw Cut Score** | ||
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| + | (ScaledCut-1) - ( ( (RawCut-1) - CandidateRaw) * ( ( (ScaledCut-1) - ScaledMin) / ( (RawCut-1)- RawMinScore) ) ) | ||
| {{:scaledscore.png?200|}} | {{:scaledscore.png?200|}} | ||
