P. B. Moranda, Effect of Bias on Estimates of the Circular Probable Error, Journal of the American Statistical Association, Vol. 55, No. 292 (Dec., 1960), pp. 732-735 ...

Circular error probable, or CEP, is the radius of a circle—centered on the target—within which half of a given missile type would be expected to impact.

“The accuracy of the DF-26 is uncertain,” CSIS explained, “with speculators estimating the [circular error probability] at intermediate range between 150 to 450 meters,” or around 500 to ...

Russia’s Kh-101 cruise missiles, which a Tupolev-95MSM bomber used against terrorists in Syria for the first time on Thursday, have a circular error probable of no more than seven meters, the ...