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Statistics::Forecast 0.3

  Date Added: March 03, 2010  |  Visits: 805


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Statistics::Forecast is a Perl module that calculates a future value. This is a dummy Oriented Object module that calculates a future value by using existing values. The new value is calculated by using linear regression. SYNOPSIS use Statistics::Forecast; Create forecast object my $FCAST = Statistics::Forecast->new("My Forecast Name"); Add data $FCAST->{DataX} = @Array_X; $FCAST->{DataY} = @Array_Y; $FCAST->{NextX} = $NextX; Calculate the result $FCAST->calc; Get the result my $Result_Forecast = $FCAST->{ForecastY); INTERNALS The equation for Forecast is: a+bx, where x is the predicted value and _ _ a = y + bx b = sum((x+x)(y-y))/sum(x-x)**2 METHODS new Receives a forecast name, only to remember and returns the blessed data structure as a Statistics::Forecast object. my $FCAST = Statistics::Forecast->new("My Forecast"); calc Calculate and return the forecast value. $FCAST->calc; dump Prints data for debuging propose. $FCAST->dump; SumX Returns the sum of X values. my $SumOfX = $FCAST->{SumX}; SumY Returns the sum of Y values. my $SumOfY = $FCAST->{SumY}; SumXX Returns the sum of X**2 values. my $SumOfXX = $FCAST->{SumXX}; SumXY Returns the sum of X * Y values. my $SumOfXY = $FCAST->{SumXY}; AvgX Returns the average of X values. my $AvgX = $FCAST->{AvgX}; AvgY Returns the average of Y values. my $AvgY = $FCAST->{AvgY}; N Return the number of X values. my $N = $FCAST->{N}; EXAMPLE use Statistics::Forecast; my @Y = (1,3,7,12); my @X = (1,2,3,4); my $FCAST = Statistics::Forecast->new("My Forecast"); $FCAST->{DataX} = @X; $FCAST->{DataY} = @Y; $FCAST->{NextX} = 8; $FCAST->calc; print "The Forecast ", $FCAST->{ForecastName}; print " has the forecast value: ", $FCAST->{ForecastY}, "n";.

Requirements: No special requirements
Platforms: Linux
Keyword: Avgx Avgy Fcast Forecast Libraries Nextx Perl Module Returns Statisticsforecast Sum Sum Of Values
Users rating: 0/10

License: Freeware Size: 3.07 KB
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