# Expected value

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## Expected value

The weighted average of a probability distribution. Also known as the mean value.

## Expected Return

The return on an investment as estimated by an asset pricing model. It is calculated by taking the average of the probability distribution of all possible returns. For example, a model might state that an investment has a 10% chance of a 100% return and a 90% chance of a 50% return. The expected return is calculated as:

Expected Return = 0.1(1) + 0.9(0.5) = 0.55 = 55%.

It is important to note that there is no guarantee that the expected rate of return and the actual return will be the same. See also: Abnormal return.
References in periodicals archive ?
While planning a QC strategy to limit the maximum expected number of erroneous patient results reported owing to the occurrence of an out-of-control condition in the measurement procedure is an important step forward in more directly relating laboratory QC to patient risk, such planning does not get us all the way there.
It is also interesting to note that numerous analyses involving the expected number of runs after various baserunning transitions are done in the work of David W.
What is the expected number of people who are relieved to find they chose their own name?
Our main contribution is to investigate the evolution of the expected number of distinguished satisfying assignments, so-called locally maximal solutions (see [DB97], [KKKS98]), when the usual order parameter c ratio of constraints to variables increases.
A total of 42 cases of NHL have occurred in the cohort, compared with an expected number of 12-a standardized incidence ratio of 3.64.
In 1999-2001, 8% of deliveries at nearly 2,000 hospitals in 18 states were planned cesareans performed on women who had not gone into labor and had not previously had a cesarean; 22% of these operations involved women who had none of 12 clinical conditions that have been characterized as appropriate indications for cesarean delivery, (1) Analysts who compared the actual number of cesareans performed with the number expected for clinical reasons found that 24% of hospitals performed more than the expected number of procedures.
There were 211 suicides among the twins studied, compared with an expected number of 292 established from the standard suicide rate.
While the research uncovered a greater than expected number of deaths involving lung cancer, prostate cancer and Hodgkin's disease in the study group, these excesses were deemed statistically insignificant because no consistent correlation was found between the diseases and occupational exposure levels.
In a recent product review, ConsumerLab.com, White Plains, NY, found that one-third of the products it tested contained less than 1% of the expected number of viable bacteria.
This study examined the utilization rate of behavioral health services by children with autism spectrum disorders (ASD) over a 6-year period and compared this rate to the expected number of children with ASD in TennCare, Tennessee's managed care Medicaid program.
What is it about ENTP that indicates a higher than expected number of smokers?
DALE summarizes the expected number of years to be lived in what might be termed the equivalent of "full health." The U.S.

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