Calculation and Conversion Table
Calculation and Conversion Table
|CONVERSION TABLE |
|Error |Percent | |
|Rate |Accuracy |Level |
| | | |
|1: 200 |99.5 | |
|1: 100 |99 | |
|1: 50 |98 |Independent Level |
|1: 35 |97 | |
|1: 25 |96 | |
|1: 20 |95 | |
| | | |
|1: 17 |94 | |
|1: 14 |93 | |
|1: 12.5 |92 |Instructional Level |
|1: 11.75 |91 | |
|1: 10 |90 | |
| | | |
|1: 9 |89 | |
|1: 8 |87.5 | |
|1: 7 |85.5 | |
|1: 6 |83 |Frustration |
|1: 5 |80 |Level |
|1: 4 |75 | |
|1: 3 |66 | |
|1: 2 |50 | |
|CALCULATIONS |
|(RW = Running Words; |
|E = Errors; |
|SC = Self-corrections) |
|Accuracy Rate |
|To calculate the accuracy rate, subtract the number of errors from the |
|running words and then divide by the number of running words. Accuracy rate |
|is represented as a percentage. |
|Running Words – Errors |
|Running Words |
| |
|e.g. 150-15 = .90 or 90% |
|150 |
| |
|RW – E |
|RW |
|Self-correction Rate |
|To calculate the self-correction rate, add the number of errors to the number|
|of self-corrections and then divide by the number of self-corrections. |
|Self-correction rate is represented as a ratio. |
| |
|Errors + Self-Corrections |
|Self-Corrections |
| |
|e.g. 15 + 5 = 4 or Ratio 1: 4 |
|5 |
|E + SC |
|SC |
|Alternate Way to Calculate Accuracy Rate: Use of Conversion Table |
|Calculate the error rate, by dividing the running words by the number of errors. Error rate is represented as a ratio. |
| |
|Running Words |
|Errors |
| |
|e.g. 150 = 10 or Ratio 1: 10 |
|15 |
|Round that number to the nearest whole number (e.g. 9.5 round to 10; 9.2 round to 9). |
|Locate the ratio on the chart above. |
|Always go DOWN to the next lowest number if the exact ratio is not on the chart (e.g. if your ratio is 1:16, you would go down to 1:14 on the chart). |
|Locate your corresponding percent of accuracy for the accuracy rate. |
Based on: p. 68 An Observation Survey, 2013 Marie M. Clay
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