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expectation

expectation

27 7.9
The average value from many results of a random event
  • noun
  • /ˌɛkspɛkˈteɪʃən/
  • Specialized
translation icon : valor esperado
  • In statistics, the expectation of a random variable is calculated by dividing the total of all possible values by the number of those values.
  • normal expectations
  • rational expectations
  • expectation (p < .01)

Examples

  • To find the expectation of this experiment, we need to sum the outcomes and divide by the total number of trials.

  • The expectation of the survey results was determined by averaging the scores of each participant.

  • This way, the expectation level goes down.

  • Sometimes our expectations are betrayed by the numbers.

  • Over the next twenty years, other states would expand their expectations of mothers to earn.

    Academic text (1995)
  • The consumer may form an expectation of the payoff of an investment.

    Academic text (1991)
  • Individual teaching efficacy is the situation-specific expectation that the teacher can help students.

    Academic text (1995)
  • Like the railroad trainees, the Foundation associates had no expectation of compensation.

    Academic text (2017)
  • Long-run growth expectations for financial assets need to be anchored in reasonable growth expectations for the overall economy.

    Academic text (2017)
  • New programs in Women's Studies are established in the open expectation that they will be academic manifestations of feminism.

    Academic text (1993)

Synonyms

average
vsexpectation
739 1.3

The usual level of something, often shown by a number

is the probabilistic mean calculated for random variables using distribution info
mean
vsexpectation
  • Specialized
37 5.1

Having the average value for a set of numbers

is the probabilistic central value for random variables in statistics
expected value
vsexpectation
  • Specialized
2 6.6

You find the average result you expect by adding each possible outcome times its chance

uses a simple unweighted division by number, not probability weights
first moment
vsexpectation
  • Specialized
1 7.2

The average of a set of numbers that you get by adding them and dividing by how many there are

is used for random variables in probability instead of basic sample averages
mean value
vsexpectation
  • Specialized
1 3.4

The average of numbers found by adding them and dividing by how many there are

applies to random variables with probability considerations rather than simple functions
arithmetic mean
vsexpectation
  • Specialized
1 3.0

A number you get when you add numbers and divide by how many numbers there are

is used for random variables in probability rather than simple data sets

Compounds

A belief about the future that is not likely to happen

Hope mixed with careful doubt about what will happen

A quiet, excited feeling in a place where people wait for something

Strong pressure you feel because other people want you to do well

Surface Forms

expectation singular
expectations plural

Morphology

expectation = expect (semi-transparent) = expect + ation

Formally derived from 'expect' + '-ation', but the statistical meaning 'expected value' is a technical extension that requires mathematical knowledge to interpret as a numerical average.

Etymology

Expectation comes from the Latin parts ex- 'out' and spectare 'to look', and in math it grew to mean the number you 'expect' on average. So the statistical expectation is the value you would 'look for' if you repeat an experiment many times.