**Jamndy**, to evaluate the value of a balance sheet, your information is insufficient. Bet on EC or straight up? Flat bet or progression? Average bet and bet higher? With 448 spins you cannot predict anything. There are several essential criteria for measuring the reliability of a method. And there are several statistical methods, depending on what we want to measure. But there is another much simpler model, by the "*empirical evaluation*" to determine an excellent level of confidence that you can give to your tests. This calculation uses the value of 5 STD, because the deviance limit would be close to 6 STD (this calculation was presented by a very old roulette players magazine (using **Marigny**'s research)). But this calculation is done in flat bet (or possibly with an average bet really very low). According to this evaluation, we can estimate that in flat bet (or with the use of a progression with very low bets), it will be necessary to gain between 5 and 10 bankrolls to be certain that the gains are not abnormal, and we are not going to give everything to the casino! This estimate is not excessive, but with some progressions with huge bets, evaluation isn’t useful, it will lose sooner or later!