# Auto Numeric node #

The Auto Numeric node estimates and compares models for continuous numeric range outcomes using a number of different methods, enabling you to try out a variety of approaches in a single modeling run\. You can select the algorithms to use, and experiment with multiple combinations of options\. For example, you could predict housing values using neural net, linear regression, C&RT, and CHAID models to see which performs best, and you could try out different combinations of stepwise, forward, and backward regression methods\. The node explores every possible combination of options, ranks each candidate model based on the measure you specify, and saves the best for use in scoring or further analysis\.

Example
:   A municipality wants to more accurately estimate real estate taxes and to adjust values for specific properties as needed without having to inspect every property\. Using the Auto Numeric node, the analyst can generate and compare a number of models that predict property values based on building type, neighborhood, size, and other known factors\.

Requirements
:   A single target field (with the role set to  Target), and at least one input field (with the role set to  Input)\. The target must be a continuous (numeric range) field, such as *age* or *income*\. Input fields can be continuous or categorical, with the limitation that some inputs may not be appropriate for some model types\. For example, C&R Tree models can use categorical string fields as inputs, while linear regression models cannot use these fields and will ignore them if specified\. The requirements are the same as when using the individual modeling nodes\. For example, a CHAID model works the same whether generated from the CHAID node or the Auto Numeric node\.

Frequency and weight fields
:   Frequency and weight are used to give extra importance to some records over others because, for example, the user knows that the build dataset under\-represents a section of the parent population (Weight) or because one record represents a number of identical cases (Frequency)\. If specified, a frequency field can be used by C&R Tree and CHAID algorithms\. A weight field can be used by C&RT, CHAID, Regression, and GenLin algorithms\. Other model types will ignore these fields and build the models anyway\. Frequency and weight fields are used only for model building and are not considered when evaluating or scoring models\.

Prefixes
:   If you attach a table node to the nugget for the Auto Numeric Node, there are several new variables in the table with names that begin with a $ prefix\.
:   The names of the fields that are generated during scoring are based on the target field, but with a standard prefix\. Different model types use different sets of prefixes\.
:   For example, the prefixes $G, $R, $C are used as the prefix for predictions that are generated by the Generalized Linear model, CHAID model, and C5\.0 model, respectively\. $X is typically generated by using an ensemble, and $XR, $XS, and $XF are used as prefixes in cases where the target field is a Continuous, Categorical, or Flag field, respectively\.
:   $\.\.E prefixes are used for the prediction confidence of a Continuous target; for example, $XRE is used as a prefix for ensemble Continuous prediction confidence\. $GE is the prefix for a single prediction of confidence for a Generalized Linear model\.

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