Manuals/calci/REGRESSION

REGRESSIONANALYSIS(y,x)

• $y$ is the set of dependent variables .
• $x$ is the set of independent variables.

Description

• This function is calculating the Regression analysis of the given data.
• This analysis is very useful for the analyzation of large amounts of data and making predictions.
• This analysis give the result in three table values.

1. Regression statistics table.
2. ANOVA table.
3. Residual output.

• 1.Regression statistics :
• It contains multiple R, R Square, Adjusted R Square, Standard Error and observations.
• R square gives the fittness of the data with the regression line.
• That value is closer to 1 is the better the regression line fits the data.
• Standard Error refers to the estimated standard deviation of the error term. It is called the standard error of the regression.
• 2.ANOVA table:
• ANOVA is the analysis of variance.
• This table splits in to two components which is Residual and Regression.
• Total sum of squares= Residual (error) sum of squares+ Regression (explained) sum of squares.
• Also this table gives the probability, T stat, significance of F and P.
• When the significance of F is < 0.05, then the result for the given data is statistically significant.
• When the significance of F is > 0.05, then better to stop using this set of independent variables.
• Then remove a variable with a high P-value and returnun the regression until Significance F drops below 0.05.
• So the Significance of P value should be <0.05.
• This table containing the regression coefficient values also.
• 3.Residual output:
• The residuals show you how far away the actual data points are fom the predicted data points.

Examples

1. Temperature - Drying time(hours)

54 - 8 63 - 6 75 - 3 82 - 1 REGRESSIONANALYSIS(A1:A4,B1:B4)= Unit sales - Ads - population 4000 - 12000 - 300000 5200 - 13150 - 411000 6800 - 14090 - 500000 8000 - 11900 - 650000 10000 - 15000 - 800000 REGRESSIONANALYSIS(B1:B5,C1:D5)=