Conversion Between CEP, RMS, 2DRMS, and R95
While 50% is a very common definition for CEP, the circle dimension can be defined for percentages. Approximate formulas are available to convert the distributions along the two axes into the equivalent circle radius for the specified percentage.
| Accuracy Measure | Probability (%) |
|---|---|
| Root mean square (RMS) | 63 to 68 |
| Circular error probability (CEP) | 50 |
| Twice the distance root mean square (2DRMS) | 95 to 98 |
| 95% radius (R95) | 95 |
| From/to | CEP | RMS | R95 | 2DRMS |
|---|---|---|---|---|
| CEP | - | 1.2 | 2.1 | 2.4 |
| RMS | 0.83 | - | 1.7 | 2.0 |
| R95 | 0.48 | 0.59 | - | 1.2 |
| 2DRMS | 0.42 | 0.5 | 0.83 | - |
Read more about this topic: Circular Error Probable
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