Information Gain in Decision Trees - Constructing A Decision Tree Using Information Gain

Constructing A Decision Tree Using Information Gain

A decision tree can be constructed top-down using the information gain in the following way:

  1. begin at the root node
  2. determine the attribute with the highest information gain which is not already used as an ancestor node
  3. add a child node for each possible value of that attribute
  4. attach all examples to the child node where the attribute values of the examples are identical to the attribute value attached to the node
  5. if all examples attached to the child node can be classified uniquely add that classification to that node and mark it as leaf node
  6. go back to step two if there are unused attributes left, otherwise add the classification of most of the examples attached to the child node

Read more about this topic:  Information Gain In Decision Trees

Famous quotes containing the words constructing, decision, tree, information and/or gain:

    “The very hope of experimental philosophy, its expectation of constructing the sciences into a true philosophy of nature, is based on induction, or, if you please, the a priori presumption, that physical causation is universal; that the constitution of nature is written in its actual manifestations, and needs only to be deciphered by experimental and inductive research; that it is not a latent invisible writing, to be brought out by the magic of mental anticipation or metaphysical mediation.”
    —Chauncey Wright (1830–1875)

    “The decision to feed the world
    is the real decision. No revolution
    has chosen it. For that choice requires
    that women shall be free.”
    —Adrienne Rich (b. 1929)

    “A tree the span of two arms starts from a tiny seedling.”
    —Chinese proverb.

    Lao-tzu.

    “The family circle has widened. The worldpool of information fathered by the electric media—movies, Telstar, flight—far surpasses any possible influence mom and dad can now bring to bear. Character no longer is shaped by only two earnest, fumbling experts. Now all the world’s a sage.”
    —Marshall McLuhan (1911–1980)

    “As the Sandwich Islander believes that the strength and valor of the enemy he kills passes into himself, so we gain the strength of the temptation we resist.”
    —Ralph Waldo Emerson (1803–1882)