thx Maclir for clarifying the definitions.
i'm interested as the title and the little formula indicates in the accuracy, which as physician i would describe in analogy to a statistical random walk depending on the square root of how many times you walk(multiplicate) multiplicated with the inevitable machine inaccuracy.
"how close to the correct value is my answer" permits some level of trust to the data, doesn't it?
but please tell more if you can dig up :)