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amy绿野仙踪

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注册: 2011-11-15
专业: 计算机网络

[求助] Matlab 与帕累托分布

求高手相助！！！急！！！
什么是帕累托分布、截头帕累托分布，在Matlab程序里怎么用！！！
GPRND Random arrays from the generalized Pareto distribution.
R = GPRND(K,SIGMA,THETA) returns an array of random numbers chosen from the
generalized Pareto (GP) distribution with tail index (shape) parameter K,
scale parameter SIGMA, and threshold (location) parameter THETA.  The size
of R is the common size of K, SIGMA, and THETA if all are arrays.  If any
parameter is a scalar, the size of R is the size of the other parameters.

R = GPRND(K,SIGMA,THETA,M,N,...) or R = GPRND(K,SIGMA,[M,N,...]) returns
an M-by-N-by-... array.

When K = 0 and THETA = 0, the GP is equivalent to the exponential
distribution.  When K > 0 and THETA = SIGMA/K, the GP is equivalent to the
Pareto distribution.  The mean of the GP is not finite when K >= 1, and the
variance is not finite when K >= 1/2.  When K >= 0, the GP has positive
density for X>THETA, or, when K < 0, for 0 <= (X-THETA)/SIGMA <= -1/K.

看不懂 (K,SIGMA,THETA,M,N,...) 这些参数都是什么意思？？？？
非常感谢111

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