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  2. Greek letters used in mathematics, science, and engineering

    en.wikipedia.org/wiki/Greek_letters_used_in...

    the population mean or expected value in probability and statistics; a measure in measure theory; micro-, an SI prefix denoting 10 −6 (one millionth) Micrometre or micron (retired in 1967 as a standalone symbol, replaced by "μm" using the standard SI meaning) the coefficient of friction in physics; the service rate in queueing theory

  3. Life expectancy - Wikipedia

    en.wikipedia.org/wiki/Life_expectancy

    If the assumption is made that, on average, people live a half year on the year of their death, the complete life expectancy at age would be + /, which is denoted by e̊ x, and is the intuitive definition of life expectancy. By definition, life expectancy is an arithmetic mean. It can also be calculated by integrating the survival curve from 0 ...

  4. List of Greek regions by life expectancy - Wikipedia

    en.wikipedia.org/wiki/List_of_Greek_regions_by...

    The vast majority of European countries achieved best values in life expectancy in 2019, the last year before the COVID-19 pandemic. Greece is rare exception to this pattern - in it, the peak of the average life expectancy occurred in 2018.

  5. List of countries by life expectancy - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_life...

    From the beginning of the current century there is a tendency to also estimate healthy life expectancy (HALE), the average number of years that a person can expect to live in "full health". [2] [3] Comparing life expectancies across countries can be problematic. For example, due to poor reporting in some countries and various local standards in ...

  6. Longevity - Wikipedia

    en.wikipedia.org/wiki/Longevity

    Longevity may refer to especially long-lived members of a population, whereas life expectancy is defined statistically as the average number of years remaining at a given age. For example, a population's life expectancy at birth is the same as the average age at death for all people born in the same year (in the case of cohorts).

  7. Healthy Life Years - Wikipedia

    en.wikipedia.org/wiki/Healthy_Life_Years

    The Healthy Life Years (HLY) indicator, also known as disability-free life expectancy (DFLE) or Sullivan's Index, is a European structural indicator computed by Eurostat. It is one of the summary measures of population health, known as health expectancies, [1] composite measures of health that combine mortality and morbidity data to represent ...

  8. Thoughts of suicide can be active or passive, but what is the ...

    www.aol.com/lifestyle/thoughts-suicide-active...

    Suicidal ideation exists on a spectrum: passive and active. The main difference is the intent and plan that accompanies the words. Thoughts of suicide can be active or passive, but what is the ...

  9. Compartmental models in epidemiology - Wikipedia

    en.wikipedia.org/wiki/Compartmental_models_in...

    For the full specification of the model, the arrows should be labeled with the transition rates between compartments. Between S and I, the transition rate is assumed to be (/) / = /, where is the total population, is the average number of contacts per person per time, multiplied by the probability of disease transmission in a contact between a susceptible and an infectious subject, and / is ...