Description Usage Arguments Details Value Author(s) References Examples
Mean and variance of a discrete Weibull distribution with parameters q and beta.
1 | dw.meanvar(q,beta,M)
|
q,beta |
Parameters of the distribution |
M |
Maximum value of the summation. Default value is 1000. |
The mean and variance are computed using the following approximations:
E(X)=∑_{k=1}^{M} q^{k^{β}}
E(X^2)=∑_{k=1}^{M} (2k-1)q^{k^{β}} = 2∑_{k=1}^{M} kq^{k^{β}}-E(X)
The function returns the mean and variance of a DW distribution with parameters q and beta.
Veronica Vinciotti
Khan M, Khalique A, Abouammoth A. On estimating parameters in a discrete Weibull distribution. IEEE transactions on Reliability 1989; 38(3):348-350.
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