Statistics::Forecast - 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.
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);
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
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");
Calculate and return the forecast value.
Prints data for debuging propose.
$FCAST->dump;
Returns the sum of X values.
my $SumOfX = $FCAST->{SumX};
Returns the sum of Y values.
my $SumOfY = $FCAST->{SumY};
Returns the sum of X**2 values.
my $SumOfXX = $FCAST->{SumXX};
Returns the sum of X * Y values.
my $SumOfXY = $FCAST->{SumXY};
Returns the average of X values.
my $AvgX = $FCAST->{AvgX};
Returns the average of Y values.
my $AvgY = $FCAST->{AvgY};
Return the number of X values.
my $N = $FCAST->{N};
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";
This module was developed by Alex Falcao (alexjfalcao@hotmail.com)
This is the first version and calculates forecast value.
0.3
This module is released for free public use under a GPL license.
To install Statistics::Forecast, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Statistics::Forecast
CPAN shell
perl -MCPAN -e shell install Statistics::Forecast
For more information on module installation, please visit the detailed CPAN module installation guide.