  In this paper we have suggested two classes of estimators for population
median M_Y of the study character Y using information on two auxiliary
characters X and Z in double sampling. It has been shown that the suggested
classes of estimators are more efficient than the one suggested by Singh et al
(2001). Estimators based on estimated optimum values have been also considered
with their properties. The optimum values of the first phase and second phase
sample sizes are also obtained for the fixed cost of survey.
