Result space

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As a result, space , result set , result quantity , Omega amount or sample space is called the mathematical branch of stochastics , the amount of all possible results of a random experiment . To describe such an experiment with the help of a probability space , certain subsets of the result space , the events , are assigned probabilities.

To set up a suitable sample space in multi-stage random experiments, can sometimes as a simple tool decision tree can be used.


  • When rolling a die , the result space is:
  • With a simple coin toss, the result space is:
  • When tossing two distinguishable coins at the same time, the result space is:, where the large coins are represented by and the small coins by .
  • It is entirely possible that there are two or more reasonable result spaces for a random experiment. For example, if you look at the random experiment of drawing a card from a deck of cards , the result set can include the card values ​​(ace, 2, 3, ...) or the suit values ​​(clubs, spades, hearts, diamonds). However, a full listing of the results would take into account both card value and suit. A corresponding result set can be generated as a Cartesian product of the two previous result sets.


To calculate the probability of discrete events according to Laplace, it is essential to know the thickness of the result space . Result spaces also occur with probability spaces. A probability space builds on a result space, but defines a set of “interesting events”, the event algebra , on which the probability measure is defined. For a more explicit presentation in context and with an example see probability theory .

Definition of terms: event space - result space

The concept of the result space is the analogue of the event space in inductive statistics .

In the literature, a careful distinction is not always made between the terms event system , event space (in the sense of the measurement space) and result space . Therefore it happens that the result space is called an event space.

See also

  • Phase space , the set of all possible states of a dynamic system


Individual evidence

  1. ^ Georgii: Stochastics. 2009, p. 8.