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# Statistics::Forecast 0.3

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 Developer: License / Price: Last Updated: Category: Alex Falcao | More programs Perl Artistic License / FREE May 23rd, 2007, 20:05 GMT ROOT / Programming / Libraries

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## Statistics::Forecast is a Perl module that calculates a future value.

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");

\$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:

· Perl

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Requirements:

· Perl

### TAGS:

future value | calculate values | forecast statistics | Statistics::Forecast | calculate | future

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