A least absolute deviation (LAD) is used to find the error criterion to obtain regression trees. Logical analysis of data is one other classification method proposed in optimization literature. In LAD a classifier is build based on learning a logical expression. LAD is binary classifier and hence can distinguish between positive and negative samples. The basic assumption of LAD model is that a binary point covered by some positive patterns, but not covered by any negative pattern is positive, and similarly, a binary point covered by some negative patterns, but not covered by positive pattern is negative. For a given data set LAD model constructs large set patterns and selects subset of them which satisfies the above assumption such that each pattern in the model satisfies certain requirement in terms of prevalence and homogeneity. Logical Analysis of Data (LAD) tree is the classifier for binary target variable based on learning a logical expression that can distinguish between positive and negative samples in a data set. The central concept in LAD tree algorithm is that of classification, clustering, and other problems. The construction of LAD model for a given data
set typically involves the generation of large set patterns and the selection of a subset of them that satisfies the above assumption such that each pattern in the model satisfies certain requirements in terms of prevalence and homogeneity. LADTree is a class for generating a multiclass alternating decision tree using logistics strategy. LADTree produces a multi- class LADTree. It has the capability to have more than two class inputs. It performs additive logistic regression using the Logistics Strategy