Changeset 20604 in project


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Timestamp:
10/03/10 12:39:52 (9 years ago)
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svnwiki
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Anonymous wiki edit for IP [86.141.186.14]:

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  • wiki/eggref/4/statistics

    r20603 r20604  
    1111To use this library, you need to understand the underlying statistics.  In brief:
    1212
    13 The [[http://en.wikipedia.org/wiki/Binomial_distribution|Binomial distribution]] is used when counting discrete events in a series of trials, each of which events has a probability p of producing a positive outcome.  An example would be tossing a coin {{n}} times: the probability of a head is {{p}}, and the distribution gives the expected number of heads in the {{n}} trials.
    14 
    15 The [[http://en.wikipedia.org/wiki/Poisson_distribution|Poisson distribution]] is used to count discrete events which occur with a known average rate.  A typical example is the decay of radioactive elements.
    16 
    17 The [[http://en.wikipedia.org/wiki/Normal_distribution|Normal distribution]] is used for real-valued events which cluster around a specific mean with a symmetric variance.  A typical example would be the distribution of people's heights.
     13The [[http://en.wikipedia.org/wiki/Binomial_distribution|Binomial distribution]] is used when counting discrete events in a series of trials, each of which events has a probability p of producing a positive outcome.  An example would be tossing a coin {{n}} times: the probability of a head is {{p}}, and the distribution gives the expected number of heads in the {{n}} trials.  The binomial distribution is defined as B(n, p).
     14
     15The [[http://en.wikipedia.org/wiki/Poisson_distribution|Poisson distribution]] is used to count discrete events which occur with a known average rate.  A typical example is the decay of radioactive elements.  A poisson distribution is defined Pois(mu).
     16
     17The [[http://en.wikipedia.org/wiki/Normal_distribution|Normal distribution]] is used for real-valued events which cluster around a specific mean with a symmetric variance.  A typical example would be the distribution of people's heights.  A normal distribution is defined N(mean, variance).
    1818
    1919== Provided Functions
     
    238238returns the cumulative distribution function (CDF) of the standard normal distribution.
    239239 > (do-ec (: x -2 2 0.4)
    240          (format #t "~4,1f ~,4f~&" x (phi x)))
     240          (format #t "~4,1f ~,4f~&" x (phi x)))
    241241 -2.0 0.0228
    242242 -1.6 0.0548
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