[Boost-bugs] [Boost C++ Libraries] #7402: Typo in math example

Subject: [Boost-bugs] [Boost C++ Libraries] #7402: Typo in math example
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-09-21 15:03:39

#7402: Typo in math example
----------------------------------+-----------------------------------------
 Reporter:  n.g.davies@…          |       Owner:  johnmaddock
     Type:  Bugs                  |      Status:  new        
Milestone:  To Be Determined      |   Component:  math       
  Version:  Boost 1.52.0          |    Severity:  Problem    
 Keywords:                        |  
----------------------------------+-----------------------------------------
 In the function {{{two_samples_t_test_equal_sd}}} in
 libs/math/example/students_t_two_samples.cpp:

 {{{
    //
    // Now we can calculate and output some stats:
    //
    // Degrees of freedom:
    double v = Sn1 + Sn2 - 2;
    cout << setw(55) << left << "Degrees of Freedom" << "=  " << v << "\n";
    // Pooled variance:
    double sp = sqrt(((Sn1-1) * Sd1 * Sd1 + (Sn2-1) * Sd2 * Sd2) / v);
 /********* THIS LINE BELOW **********/
    cout << setw(55) << left << "Pooled Standard Deviation" << "=  " << v
 << "\n";
    // t-statistic:
    double t_stat = (Sm1 - Sm2) / (sp * sqrt(1.0 / Sn1 + 1.0 / Sn2));
    cout << setw(55) << left << "T Statistic" << "=  " << t_stat << "\n";
 }}}

 I believe the line marked should have {{{sp}}} in place of {{{v}}}.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7402>
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