Fundamentals of Computing by Levin L.A.

By Levin L.A.

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It must be a positive numeric value. Stepwise Options. These options give you control of the statistical criteria when stepwise methods are used to build a model. They are ignored unless a stepwise model is specified in the Model dialog box. 22 Chapter 3 „ Entry Probability. This is the probability of the likelihood-ratio statistic for variable entry. The larger the specified probability, the easier it is for a variable to enter the model. This criterion is ignored unless the forward entry, forward stepwise, or backward stepwise method is selected.

Set a critical value for derivative checking. „ Set a step limit. „ Specify a crash tolerance to determine if initial values are within their specified bounds. See the SPSS Command Syntax Reference for complete syntax information. Chapter Weight Estimation 6 Standard linear regression models assume that variance is constant within the population under study. When this is not the case—for example, when cases that are high on some attribute show more variability than cases that are low on that attribute—linear regression using ordinary least squares (OLS) no longer provides optimal model estimates.

Available options are Predicted values, Residuals, Derivatives, and Loss function values. These variables can be used in subsequent analyses to test the fit of the model or to identify problem cases. „ Predicted Values. Saves predicted values with the variable name pred_. „ Residuals. Saves residuals with the variable name resid. „ Derivatives. One derivative is saved for each model parameter. ' to the first six characters of parameter names. „ Loss Function Values. This option is available if you specify your own loss function.

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