|
|
|
| R2012a Documentation → Statistics Toolbox | |
Learn more about Statistics Toolbox |
|
| Contents | Index |
Compact ensemble of decision trees grown by bootstrap aggregation
CompactTreeBagger class is a lightweight class that contains the trees grown using TreeBagger. CompactTreeBagger does not preserve any information about how TreeBagger grew the decision trees. It does not contain the input data used for growing trees, nor does it contain training parameters such as minimal leaf size or number of variables sampled for each decision split at random. You can only use CompactTreeBagger for predicting the response of the trained ensemble given new data X, and other related functions.
CompactTreeBagger lets you save the trained ensemble to disk, or use it in any other way, while discarding training data and various parameters of the training configuration irrelevant for predicting response of the fully grown ensemble. This reduces storage and memory requirements, especially for ensembles trained on large datasets.
| CompactTreeBagger | Create CompactTreeBagger object |
| combine | Combine two ensembles |
| error | Error (misclassification probability or MSE) |
| margin | Classification margin |
| mdsProx | Multidimensional scaling of proximity matrix |
| meanMargin | Mean classification margin |
| outlierMeasure | Outlier measure for data |
| predict | Predict response |
| proximity | Proximity matrix for data |
| SetDefaultYfit | Set default value for predict |
ClassNames |
The ClassNames property is a cell array containing the class names for the response variable Y supplied to TreeBagger. This property is empty for regression trees. |
DeltaCritDecisionSplit |
The DeltaCritDecisionSplit property is a numeric array of size 1-by-Nvars of changes in the split criterion summed over splits on each variable, averaged across the entire ensemble of grown trees. See also TreeBagger.DeltaCritDecisionSplit, classregtree.varimportance |
DefaultYfit |
The DefaultYfit property controls what predicted value CompactTreeBagger returns when no prediction is possible, for example when the predict method needs to predict for an observation which has only false values in the matrix supplied through 'useifort' argument. For classification, you can set this property to either '' or 'MostPopular'. If you choose 'MostPopular' (default), the property value becomes the name of the most probable class in the training data. For regression, you can set this property to any numeric scalar. The default is the mean of the response for the training data. See also predict, setDefaultYfit, TreeBagger.DefaultYfit. |
Method |
The Method property is 'classification' for classification ensembles and 'regression' for regression ensembles. |
NTrees |
The NTrees property is a scalar equal to the number of decision trees in the ensemble. |
NVarSplit |
The NVarSplit property is a numeric array of size 1-by-Nvars, where every element gives a number of splits on this predictor summed over all trees. |
Trees |
The Trees property is a cell array of size NTrees-by-1 containing the trees in the ensemble. |
VarAssoc |
The VarAssoc property is a matrix of size Nvars-by-Nvars with predictive measures of variable association, averaged across the entire ensemble of grown trees. If you grew the ensemble setting 'surrogate' to 'on', this matrix for each tree is filled with predictive measures of association averaged over the surrogate splits. If you grew the ensemble setting 'surrogate' to 'off' (default), VarAssoc is diagonal. See also classregtree.MeanSurrVarAssoc |
VarNames |
The VarNames property is a cell array containing the names of the predictor variables (features). These names are taken from the optional 'names' parameter that supplied to TreeBagger. The default names are 'x1', 'x2', etc. |
Value. To learn how this affects your use of the class, see Comparing Handle and Value Classes in the MATLAB Object-Oriented Programming documentation.
| © 1984-2012- The MathWorks, Inc. - Site Help - Patents - Trademarks - Privacy Policy - Preventing Piracy - RSS |