Does anybody know how to determine starting level in Bruceton test(The up and Down method of Dixon and Mood)? Where can I find more information in this topic?

For the most efficient test, you should pick the first level at the mean of the population and the step size as the standard deviation of the population. Of course the reason for doing the test is to determine these values, so you have to use the best guess for these starting values. For more details, and for a look at a new test that does not require prior knowledge, goto www.neyersoftware.com