random - Select data based on a distribution in matlab -

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i have set of data in vector. if plot histogram of data see (by clever inspection) data distributed sum of 3 distributions;

one normal distribution centered around x_1 variance s_1; 1 normal distribution centered around x_2 variance s_2; once lognormal distribution.

my data subset of 'real' data.

what take random subset of data away data ensuring resulting subset reasonable representative sample of original data.

i possible in matlab new both statistics , matlab , unsure start.

thank :)

if can identify each of 3 distributions (in sense can estimate parameters), 1 approach select random subset of data , try estimate parameters each distribution , see whether close enough (according own definition of "close") parameters of original distributions. should repeat process several time , @ average difference given random subset size.


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