1.2.3-SNAPSHOT Arrow_down_16x16

pdf-poisson

incanter.stats

  • (pdf-poisson x & options)
Returns the Poisson pdf of the given value of x. It will return a sequence
of values, if x is a sequence. Same as R's dpois

Options:
:lambda (default 1)

See also:
cdf-poisson and sample-poisson

References:
http://incanter.org/docs/parallelcolt/api/cern/jet/random/tdouble/Poisson.html
http://en.wikipedia.org/wiki/Poisson_distribution
http://en.wikipedia.org/wiki/Probability_density_function

Example:
(pdf-poisson 5 :lambda 10)

1 Example top

  • ;In Clojure
    (pdf-poisson 57 :lambda 50)
    ;0.03302345879160118      
    
    ;In R
    ;> dpois(57, 50, log=FALSE)
    ;[1] 0.03302346         
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Plus_12x12 Minus_12x12 Source incanter/stats.clj:1216 top

(defn pdf-poisson
" Returns the Poisson pdf of the given value of x. It will return a sequence
  of values, if x is a sequence. Same as R's dpois

  Options:
    :lambda (default 1)

  See also:
      cdf-poisson and sample-poisson

  References:
      http://incanter.org/docs/parallelcolt/api/cern/jet/random/tdouble/Poisson.html
      http://en.wikipedia.org/wiki/Poisson_distribution
      http://en.wikipedia.org/wiki/Probability_density_function

  Example:
      (pdf-poisson 5 :lambda 10)
"
  ([x & options]
    (let [opts (when options (apply assoc {} options))
          lambda (or (:lambda opts) 1)
          dist (Poisson. lambda (DoubleMersenneTwister.))]
      (if (coll? x)
        (map #(.pdf dist %) x)
        (.pdf dist x)))))
Vars in incanter.stats/pdf-poisson: coll? defn let map
Used in 0 other vars

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