Public Health Degrees. Public health programs focus on protecting and improving the health of communities. Students in these programs learn to conduct disease-related research and analyze the effects of genetics and the environment on an individual's health.
What is a 'Z-Score'. A Z-score is a numerical measurement of a value's relationship to the mean in a group of values. If a Z-score is 0, it represents the score is identical to the mean score. Z-scores may also be positive or negative, with a positive value indicating the score is above the mean and a negative score indicating it is below the mean. Positive and negative scores also reveal the number of standard deviations the score is either above or below the mean.
The z-average is determined according to an ISO method [ ISO13321:1996 or its newer pendant ISO22412:2008 ] where only the initial part of the correlation function (up to 10% of the intercept) is force fit to a single exponential decay. The decay rate is related to the overall mean size.