Gain ratio decision tree
In decision tree learning, Information gain ratio is a ratio of information gain to the intrinsic information. It was proposed by Ross Quinlan, to reduce a bias towards multi-valued attributes by taking the number and size of branches into account when choosing an attribute.
How is Gain Ratio calculated in decision tree?
First, determine the information gain of all the attributes, and then compute the average information gain. Second, calculate the gain ratio of all the attributes whose calculated information gain is larger or equal to the computed average information gain, and then pick the attribute of higher gain ratio to split.
What is Gain Ratio in data mining?
Gain Ratio is modification of information gain that reduces its bias. Gain ratio overcomes the problem with information gain by taking into account the number of branches that would result before making the split.It corrects information gain by taking the intrinsic information of a split into account.
How do you calculate Gain Ratio?
Calculation of Gaining Ratio
- Gaining Ratio = New Ratio – Old Ratio.
- New Ratio = Old Ratio + Gain.
- Gaining Ratio = Retiring partner's share x Acquisition Ratio.
- New Ratio = Old Ratio + Gaining Ratio.
What is Gain Ratio in feature selection?
Gain ratio (GR) is a modification of the information gain that reduces its bias. Gain ratio takes number and size of branches into account when choosing an attribute. It corrects the information gain by taking the intrinsic information of a split into account.
What is gain in decision tree?
Information gain is the reduction in entropy or surprise by transforming a dataset and is often used in training decision trees. … Information gain is calculated by comparing the entropy of the dataset before and after a transformation.
Why use Gain Ratio over information gain?
Gain ratio strategy, leads to better generalization (less overfitting) of DT models and it is better to use Gain ration in general.
What is the Gain Ratio?
Gaining ratio is calculated at the time of retirement or death of a partner. It is the ratio in which the remaining partners acquire the outgoing partner's share of profit. When the partner retires, the profit sharing ratio of the continuing partners gets changed.