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stats_item_distribution [2017/02/13 11:08] 127.0.0.1 external edit |
stats_item_distribution [2017/03/06 14:04] (current) steveclarke |
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| - | ====== Item Statistics and Results ====== | + | ====== Item Response Distribution Statistics and Results ====== |
| - | Table: **ceStatsExamQuestion** | + | Table: **ceStatsExamQuestionDistribution** |
| - | Aggregate of [[stats_candidate_item|Candidate Item Stats]] for each Item on the Exam. | + | The response distributions are counts of Candidates in certain ranking thresholds that match a given response. The rankings for the candidates is based on their Ranking of ValueTotal on the Exam compared to all other Candidates performance. |
| ^Field^Description^ | ^Field^Description^ | ||
| |StatsID|Unique Identifier for this set of Statistics| | |StatsID|Unique Identifier for this set of Statistics| | ||
| |QuestionID|ID of Item in the Bank| | |QuestionID|ID of Item in the Bank| | ||
| + | |Response|Response for Multiple Choice: \\ -2(Not Reached) \\ -1 (Bubbling Error) \\ 0 (Skipped) \\ 1 (A) \\ 2 (B) \\ … \\ \\ Response for Essay = point value awarded| | ||
| |Sequence|Sequence of Item on the Exam| | |Sequence|Sequence of Item on the Exam| | ||
| - | |ValueMax|Maximum achievable points for Item| | + | |Decile1|Count of Candidates in Decile 1 (Exam) that match this response, see [[stats_concepts#decile|Decile]]| |
| - | |QtyCorrect|Total of all QtyCorrect for Item for all Candidates| | + | |Decile2|Count of Candidates in Decile 2 (Exam) that match this response| |
| - | |QtySkipped|Total of all QtySkipped for Item for all Candidates| | + | |Decile3|Count of Candidates in Decile 3 (Exam) that match this response| |
| - | |QtyIncorrect|Total of all QtyIncorrect for Item for all Candidates| | + | |Decile4|Count of Candidates in Decile 4 (Exam) that match this response| |
| - | |RawPercent|x = Count of Correct Items on Exam \\ n = Count of Candidates on Exam \\ \\ {{:stat_rawpercent_candidate.png|}}| | + | |Decile5|Count of Candidates in Decile 5 (Exam) that match this response| |
| - | |ValueCorrect|Total of all ValueCorrect for Item for all Candidates| | + | |Decile6|Count of Candidates in Decile 6 (Exam) that match this response| |
| - | |ValueSkipped|Total of all ValueSkipped for Item for all Candidates| | + | |Decile7|Count of Candidates in Decile 7 (Exam) that match this response| |
| - | |ValueIncorrect|Total of all ValueIncorrect for Item for all Candidates| | + | |Decile8|Count of Candidates in Decile 8 (Exam) that match this response| |
| - | |ValueTotal|(ValueCorrect + ValueSkipped + ValueIncorrect)| | + | |Decile9|Count of Candidates in Decile 9 (Exam) that match this response| |
| - | |ValuePercent|{{:stat_valuepercent.png|}}| | + | |Decile10|Count of Candidates in Decile 10 (Exam) that match this response| |
| - | |Difficulty|x = Count of Correct Items on Exam \\ n = Count of Candidates on Exam \\ \\ {{:stat_difficulty_candidate.png|}}| | + | |Distribution1|Count of Candidates in top 20% (Exam) that match this response| |
| - | |QuestionDiscrimination|A value between -1 and 1 \\ \\ Q1 is the Count of Candidates who responded correctly to Item whose Value total is in the top 27% of all Candidates taking the Exam. \\ Q4 is the Count of Candidates who responded correctly to Item whose Value total is in the top 27% of all Candidates taking the Exam. \\ n = Count of Candidates \\ \\ {{:stat_questiondiscrimination.png|}}| | + | |Distribution2|Count of Candidates in 20% to 40% (Exam) that match this response| |
| - | |BiserialExam|FIXME biserials| | + | |Distribution3|Count of Candidates in 40% to 60% (Exam) that match this response| |
| - | |PointBiserialExam|m1 = Mean of correct on Exam for all Candidates that answered correctly. \\ m0 = Mean of correct on Exam for all \\ Candidates that answered incorrectly. \\ n1 = Count of all Candidates that answered correctly. \\ n0 = Count of all Candidates that answered incorrectly. \\ s = Standard deviation of Candidate correct on Exam \\ n = Total number of Candidates on Exam \\ \\ {{:stat_pointbiserial.png|}}| | + | |Distribution4|Count of Candidates in 60% to 80% (Exam) that match this response| |
| - | |BiserialCorrectedExam|FIXME biserials| | + | |Distribution5|Count of Candidates in bottom 20% (Exam) that match this response| |
| - | |PointBiserialCorrectedExam|FIXME biserials| | + | |Correct|True if the response is considered a correct option for Multiple Choice Items or is a passing value for Essay Items| |
| - | |BiserialSection|FIXME biserials| | + | |DistBottom50|Count of Candidates in bottom 50% (Exam) that match this response| |
| - | |PointBiserialSection|m1 = Mean of correct on Exam for all Candidates that answered correctly. \\ m0 = Mean of correct on Exam for all \\ Candidates that answered incorrectly. \\ n1 = Count of all Candidates that answered correctly. \\ n0 = Count of all Candidates that answered incorrectly. \\ s = Standard deviation of Candidate correct on Exam \\ n = Total number of Candidates on Exam \\ \\ {{:stat_pointbiserial.png|}}| | + | |DistTop50|Count of Candidates in top 50% (Exam) that match this response| |
| - | |BiserialCorrectedSection|FIXME biserials| | + | |Biserial|See [[stats_concepts#biserial_calculations|Biserials]]| |
| - | |PointBiserialCorrectedSection|FIXME biserials| | + | |Quartile1|Count of Candidates in top 27% (Exam) that match this response| |
| - | |BiserialCompetency|FIXME biserials| | + | |Quartile2|Count of Candidates in 27% to 50% (Exam) that match this response| |
| - | |PointBiserialCompetency|m1 = Mean of correct on Exam for all Candidates that answered correctly. \\ m0 = Mean of correct on Exam for all \\ Candidates that answered incorrectly. \\ n1 = Count of all Candidates that answered correctly. \\ n0 = Count of all Candidates that answered incorrectly. \\ s = Standard deviation of Candidate correct on Exam \\ n = Total number of Candidates on Exam \\ \\ {{:stat_pointbiserial.png|}}| | + | |Quartile3|Count of Candidates in 50% to 77% (Exam) that match this response| |
| - | |BiserialCorrectedCompetency|FIXME biserials| | + | |Quartile4|Count of Candidates in bottom 27% (Exam) that match this response| |
| - | |PointBiserialCorrectedCompetency|FIXME biserials| | + | |
| - | |ValueLow|Lowest ValueTotal achieved by a Candidate for this Item| | + | |
| - | |ValueHigh|Highest ValueTotal achieved by a Candidate for this Item| | + | |
| - | |ValueMean|Mean (average) ValueTotal achieved by a Candidate for this Item| | + | |
| - | |ValueStdev|Standard Deviation of ValueTotal for all Candidates for this Item| | + | |
| - | |ValueVariance|Variance of ValueTotal for all Candidates for this Item| | + | |
| - | |ValueMedian|Median (middle) ValueTotal for all Candidates for this Item| | + | |
| - | |ValueMode|Mode (most frequent) ValueTotal for all Candidates for this Item| | + | |
| - | |QtyCorrectTop50|Count of Candidates who responded correctly to Item whose Value total was in top 50% of all Candidates taking Exam| | + | |
| - | |QtyCorrectBottom50|Count of Candidates who responded incorrectly to Item whose Value total was in top 50% of all Candidates taking Exam| | + | |
| - | |TimeTotal|Total Time for all Candidates on this Item. Used in Online testing FIXME link| | + | |
| - | |Dichotomous|True if Item has one correct response worth 1 point and all other responses are incorrect worth 0 points.| | + | |
| - | |IncludeInStats|FIXME explain| | + | |
| - | |PROXScore|Future use| | + | |
| - | |PROXProportion|Future use| | + | |
| - | |PROXLogit|Future use| | + | |
| - | |PROXCalibration|Future use| | + | |
| - | |PROXCalibrationFinal|Future use| | + | |
| - | |PROXCalibrationError |Future use| | + | |
