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REGRESSION ANALYSIS -P H SHAMEER
[object Object],[object Object]
INTRODUCTION  ,[object Object],[object Object],[object Object]
2 types of variables ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
assumptions ,[object Object],[object Object],[object Object],[object Object]
Analysis for Linearity Not Linear Linear  x x Y x Y x
Residual Analysis for  Homoscedasticity  Non-constant variance  Constant variance x x Y x x Y residuals residuals
SCATTER PLOTS ,[object Object]
Regression Equation where a  is y intercept & b 1 , b 2, ..b i  are  regression   coefficients
How  a   &  b  can be calculated? ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
forecasting ,[object Object],[object Object],[object Object]
terminology ,[object Object],[object Object],[object Object],[object Object]
terminology ,[object Object],[object Object],[object Object],[object Object],[object Object]
Scatter Plots of Data with Various Correlation Coefficients Y X Y X Y X Y X Y X r = -1 r = -.6 r = 0 r = +.3 r = +1 Y X r = 0 ,[object Object]
terminology….. ,[object Object],[object Object],[object Object],[object Object]
terminology… ,[object Object],[object Object],[object Object],[object Object],[object Object]
Is each X contributing to the prediction of Y? ,[object Object],[object Object]
Performing regression in spss ,[object Object]
variables ,[object Object],[object Object],[object Object],[object Object]
Performing regression in spss ,[object Object]
Enter the data
Cont.. ,[object Object],[object Object],[object Object]
 
Selection methods: on relative contribution of independent variables ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Now click the statistics button Now click ‘continue’> then ‘ok’
Output:
 
 
 
Cont… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
references ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object]

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Regression analysis