# decision tree

(redirected from*Regression Tree*)

Also found in: Dictionary, Financial, Encyclopedia.

## 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**

thevetia

*peruviana*.**decision tree**

see decision tree.

**tree diagram**

see decision tree.

**tree lupin**

lupinus

*arboreus*.**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**

nicotiana

*glauca*.**tracheobronchial tree**

the trachea, bronchi and their branching structures.

**tree zamia**

cycas

*armstrongii, C. media*.Want to thank TFD for its existence? Tell a friend about us, add a link to this page, or visit the webmaster's page for free fun content.

Link to this page: