Software developers have developed many effective programming methods. However, software errors are still inevitable in software products. Estimating the number of errors in software testing is important. It is an important parameter to calculate MTTF.Because the number of errors in program directly determines the reliability of the software, in order to improve the quality and reliability of software products, we need to eliminate the errors in software products. To do this, we must understand the types of errors and we should also know the number of errors in the software Of course, the number is estimation. In order to eliminate the inherent errors in software products, three methods of estimating errors are listed in this paper. One is the instantaneous estimation method, another one is the OLS estimation method, and the last one is the capture-recapture method.
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