A Step by Step Guide for SPSS and Exercise Studies

Statistical tests 123
Dialog box 83
is particularly useful for hierarchical regression analysis. Collinearity diagnostics
estimate whether some of the independent variables have very high
correlations with other independent variables (i.e., multicollinearity). The
Durbin-Watson test under Residuals tests the assumption that the residuals in the
regression analysis are independent (see assumptions of residual analysis under
General Linear Model/Univariate in the Analyze menu). Values that deviate
from 2 indicate a non-independence of residuals. The Durbin-Watson test also
provides a table with descriptive statistics for predicted values and residuals.
Lastly, casewise diagnostics identifies cases with very large standardised
residuals. These cases are outliers.
The Save option in Dialog box 82 creates new variables in the data file which
can be used to examine the assumptions of regression analysis (Dialog box 85).
You can save the unstandardized and standardized values predicted for each
case of the dependent variable. You can also save the predicted value for a
particular case when this case has not been used in the regression analysis
(adjusted). If the predicted values change considerably you may need to revisit
the particular case as it exerts a heavy influence on the results of the regression
Dialog box 84