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1.2.3-SNAPSHOT permalink

1.2.3-SNAPSHOT

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

link | changes

;In Clojure
(pdf-poisson 57 :lambda 50)
;0.03302345879160118      

;In R
;> dpois(57, 50, log=FALSE)
;[1] 0.03302346

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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pdf-poisson

incanter.stats

1 Example top

See Also top

Source incanter/stats.clj:1216 top

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