Changeset 20604 in project

Timestamp:

10/03/10 12:39:52 (10 years ago)

Author:

svnwiki

Message:

Anonymous wiki edit for IP [86.141.186.14]:

File:

• wiki/eggref/4/statistics (modified) (2 diffs)

wiki/eggref/4/statistics

@@ -11 +11 @@
 To use this library, you need to understand the underlying statistics.  In brief:
 
-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.
-
-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.
-
-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.
+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.  The binomial distribution is defined as B(n, p).
+
+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.  A poisson distribution is defined Pois(mu).
+
+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.  A normal distribution is defined N(mean, variance).
 
 == Provided Functions
@@ -238 +238 @@
 returns the cumulative distribution function (CDF) of the standard normal distribution.
  > (do-ec (: x -2 2 0.4)
-         (format #t "~4,1f ~,4f~&" x (phi x)))
+          (format #t "~4,1f ~,4f~&" x (phi x)))
  -2.0 0.0228
  -1.6 0.0548