# decision tree

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## de·ci·sion tree

(dē-sizh'ŭn trē),
A graphic construct showing available choices at each decision node of managing a clinical problem along with probabilities (if known) of possible outcomes for patient's freedom from disability, life expectancy, and mortality.

## decision tree

a systematic method of managing a problem by graphically organizing the probabilities of outcomes of alternative treatments. At each decision node or branch a possible alternative is matched with its relative worth, quality of life, freedom from disability, and other factors on which a prognosis may be based.

## decision tree

Decision-making A schematic representation of the major steps taken in a clinical decision algorithm; a DT begins with the statement of a clinical problem that can be followed along branches, based on the presence or absence of certain objective features, and eventually arrive at a conclusion

## de·ci·sion tree

(dĕ-sizh'ŭn trē)
A graphic construct showing available choices at each decision node of managing a clinical problem along with probabilities (if known) of possible outcomes for patient's freedom from disability, life expectancy, and mortality.

## de·ci·sion tree

(dĕ-sizh'ŭn trē)
A graphic construct showing available choices at each decision node of managing a clinical problem along with probabilities (if known) of possible outcomes for patient's freedom from disability, life expectancy, and mortality.

## decision tree,

n an algorithm or a formal stepwise process used in coming to a conclusion or making a judgment.

## decision

a choice between a number of possible answers to a question.

decision analysis
a systematic approach to decision making under conditions of imperfect knowledge; a practical application of probability theory. Used to calculate the optimal strategy from among a series of alternative strategies. May be expressed graphically in the form of a decision tree (below).
decision making
making a decision can be done in three principal ways and many variations and mixtures of the methods: (1) rote, the decision is made on the basis of a set of rules and no selectivity is required; (2) intuitive, decisions are made on the basis of cerebrally stored information and reasoning systems which permit a fast response. The increasing complexity of veterinary clinical questions increases the probability of error; (3) decision analysis, a means of solving complicated problems by including all of the factors that could possibly affect the outcome of the analysis in a series of sequential questions. This gives each of the factors an opportunity of affecting the outcome. The chance of error by omission can be eliminated but the process is prolonged.
decision theory
the theoretical basis for decision analysis.
decision tree
a diagrammatic representation of the possible outcomes and events used in decision analysis. The questions to be asked in an analysis of a question are arranged as a series of nodes each with a yes and no branch, creating an arborization effect. The sequential steps proceed with each step depending on the decision made in the preceding step.

## tree

1. an anatomical structure with branches resembling a tree.
2. in information science, a decision tree.

bronchial tree
the trachea, bronchi and successive branching generations of the respiratory passages.
tree daffodil
thevetiaperuviana.
decision tree
see decision tree.
tree diagram
see decision tree.
tree lupin
lupinusarboreus.
tree nettle
see urtica.
tree shrew
primitive arboreal mammal that some taxonomists place with the primates. Like squirrels in shape and size. Called also Tupaia spp.
tree snake
a number of colubrid snakes that lead an arboreal existence and practice falling from trees with their body spread out, earning the name of flying snake.
tree tobacco
nicotianaglauca.
tracheobronchial tree
the trachea, bronchi and their branching structures.
tree zamia
cycasarmstrongii, C. media.
References in periodicals archive ?
The decision tree model constructed with the CART algorithm revealed GDP per capita as the most important determinant for estimating the share of GDP allocated to health expenditure.
Results of the goodness of fit criteria displayed that CHAID was the decision tree algorithm submitting better fitting performance in BW trait when compared with exhaustive CHAID and CART algorithms for minimum number of animals designated as 8: 4 in parent and child nodes.
Comparison between the simulation results for the five design cases listed in Table 2 with geometry parameters predicted by the good design of decision tree and the threshold SEA values of the good design (red line) and intermediate design (blue line)
The popular machine learning framework WEKA tool uses the word to refer to a decision tree built on a random split of columns.
Otherwise, the performance of classifier would be unacceptable, what is more, the accuracy of the decision trees will be greatly reduced.
Several of them make use of decision trees as prediction models, given a knowledge base, which categorizes a number of conditions to reach the solution of a problem.
0 and CART algorithms were applied for the decision tree generation to predict the groundwater potential zone with the five relating factors and the 10-fold cross validation method was adopted to verify the classification result with the kappa coefficient.
But it did show that HIV-positive smokers whose clinicians used this decision tree tool cut the number of cigarettes smoked daily more than smokers treated in the usual way.
A decision tree model is formed using a hierarchy of branches.
We have shown previously (Jormanainen & Sutinen, 2012) that data mining, and decision trees in particular, are efficient for classifying and modelling students' progress based on data originating from a robotics class.
Women's initial responses to a handful of items that best predicted whether they would rank as depressed 18 months later were used to create a four-question decision tree.

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