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# Statistics::Forecast 0.3

Date Added: March 03, 2010  |  Visits: 805

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