How can I be sure ReCal’s results are accurate?
Unfortunately, there is no way I can show a priori that ReCal will furnish accurate results for all possible datasets. 100% certainty is only possible in certain branches of pure mathematics; in the real world all sorts of things can go wrong. With ReCal, for example, very rarely people will format their data incorrectly yet manage to see results anyway, which of course will be incorrect. Barring this scenario, I would certainly encourage you to test ReCal against other reliability calculators, especially if its results appear flawed. A list of alternative reliability calculators can be found here.