I don't have my books available at the moment. Does anyone know of software or web page calculators where I can input 1) expected proportion (e.g., .5 or .8) 2) a total number of cases (e.g., 1000, 750, 500) 3) a number of PSUs (e.g., 300 to 75 by -25) 4) a confidence level .95 and get an estimate of the precision? Failing that would someone be so kind as to send the formula. =========================================================================== This list is open to everyone. Occasionally, less thoughtful people send inappropriate messages. Please DO NOT COMPLAIN TO THE POSTMASTER about these messages because the postmaster has no way of controlling them, and excessive complaints will result in termination of the list. For information about this list, including information about the problem of inappropriate messages and information about how to unsubscribe, please see the web page at http://jse.stat.ncsu.edu/ ===========================================================================
