repl.txt (2153B)
1 2 {{alias}}( [k, λ] ) 3 Returns an Erlang distribution object. 4 5 Parameters 6 ---------- 7 k: number (optional) 8 Shape parameter. Must be a positive integer. Default: `1.0`. 9 10 λ: number (optional) 11 Rate parameter. Must be greater than `0`. Default: `1.0`. 12 13 Returns 14 ------- 15 erlang: Object 16 Distribution instance. 17 18 erlang.k: number 19 Shape parameter. If set, the value must be a positive integer. 20 21 erlang.lambda: number 22 Rate parameter. If set, the value must be greater than `0`. 23 24 erlang.entropy: number 25 Read-only property which returns the differential entropy. 26 27 erlang.kurtosis: number 28 Read-only property which returns the excess kurtosis. 29 30 erlang.mean: number 31 Read-only property which returns the expected value. 32 33 erlang.mode: number 34 Read-only property which returns the mode. 35 36 erlang.skewness: number 37 Read-only property which returns the skewness. 38 39 erlang.stdev: number 40 Read-only property which returns the standard deviation. 41 42 erlang.variance: number 43 Read-only property which returns the variance. 44 45 erlang.cdf: Function 46 Evaluates the cumulative distribution function (CDF). 47 48 erlang.logpdf: Function 49 Evaluates the natural logarithm of the probability density function 50 (PDF). 51 52 erlang.mgf: Function 53 Evaluates the moment-generating function (MGF). 54 55 erlang.pdf: Function 56 Evaluates the probability density function (PDF). 57 58 erlang.quantile: Function 59 Evaluates the quantile function at probability `p`. 60 61 Examples 62 -------- 63 > var erlang = {{alias}}( 6, 5.0 ); 64 > erlang.k 65 6 66 > erlang.lambda 67 5.0 68 > erlang.entropy 69 ~0.647 70 > erlang.kurtosis 71 1.0 72 > erlang.mean 73 1.2 74 > erlang.mode 75 1.0 76 > erlang.skewness 77 ~0.816 78 > erlang.stdev 79 ~0.49 80 > erlang.variance 81 0.24 82 > erlang.cdf( 3.0 ) 83 ~0.997 84 > erlang.logpdf( 3.0 ) 85 ~-4.638 86 > erlang.mgf( -0.5 ) 87 ~0.564 88 > erlang.pdf( 3.0 ) 89 ~0.01 90 > erlang.quantile( 0.8 ) 91 ~1.581 92 93 See Also 94 -------- 95