repl.txt (2375B)
1 2 {{alias}}( [α, β] ) 3 Returns a beta distribution object. 4 5 Parameters 6 ---------- 7 α: number (optional) 8 First shape parameter. Must be greater than `0`. Default: `1.0`. 9 10 β: number (optional) 11 Second shape parameter. Must be greater than `0`. Default: `1.0`. 12 13 Returns 14 ------- 15 beta: Object 16 Distribution instance. 17 18 beta.alpha: number 19 First shape parameter. If set, the value must be greater than `0`. 20 21 beta.beta: number 22 Second shape parameter. If set, the value must be greater than `0`. 23 24 beta.entropy: number 25 Read-only property which returns the differential entropy. 26 27 beta.kurtosis: number 28 Read-only property which returns the excess kurtosis. 29 30 beta.mean: number 31 Read-only property which returns the expected value. 32 33 beta.median: number 34 Read-only property which returns the median. 35 36 beta.mode: number 37 Read-only property which returns the mode. 38 39 beta.skewness: number 40 Read-only property which returns the skewness. 41 42 beta.stdev: number 43 Read-only property which returns the standard deviation. 44 45 beta.variance: number 46 Read-only property which returns the variance. 47 48 beta.cdf: Function 49 Evaluates the cumulative distribution function (CDF). 50 51 beta.logcdf: Function 52 Evaluates the natural logarithm of the cumulative distribution function 53 (CDF). 54 55 beta.logpdf: Function 56 Evaluates the natural logarithm of the probability density function 57 (PDF). 58 59 beta.mgf: Function 60 Evaluates the moment-generating function (MGF). 61 62 beta.pdf: Function 63 Evaluates the probability density function (PDF). 64 65 beta.quantile: Function 66 Evaluates the quantile function at probability `p`. 67 68 Examples 69 -------- 70 > var beta = {{alias}}( 1.0, 1.0 ); 71 > beta.alpha 72 1.0 73 > beta.beta 74 1.0 75 > beta.entropy 76 0.0 77 > beta.kurtosis 78 -1.2 79 > beta.mean 80 0.5 81 > beta.median 82 0.5 83 > beta.mode 84 NaN 85 > beta.skewness 86 0.0 87 > beta.stdev 88 ~0.289 89 > beta.variance 90 ~0.0833 91 > beta.cdf( 0.8 ) 92 0.8 93 > beta.logcdf( 0.8 ) 94 ~-0.223 95 > beta.logpdf( 1.0 ) 96 0.0 97 > beta.mgf( 3.14 ) 98 ~7.0394 99 > beta.pdf( 1.0 ) 100 1.0 101 > beta.quantile( 0.8 ) 102 0.8 103 104 See Also 105 -------- 106