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  2. Incidence (epidemiology) - Wikipedia

    en.wikipedia.org/wiki/Incidence_(epidemiology)

    Incidence is usually more useful than prevalence in understanding the disease etiology: for example, if the incidence rate of a disease in a population increases, then there is a risk factor that promotes the incidence.

  3. Epidemiology - Wikipedia

    en.wikipedia.org/wiki/Epidemiology

    Epidemiology is the study and analysis of the distribution (who, when, and where), patterns and determinants of health and disease conditions in a defined population ...

  4. Tax incidence - Wikipedia

    en.wikipedia.org/wiki/Tax_incidence

    Budget incidence and differential incidence are logically on the same level. The only difference between these two techniques is the question they pose. Specific incidence, on the other hand, forms a preliminary stage for investigating budget incidence, and the results obtained here should be treated with caution.

  5. Rate ratio - Wikipedia

    en.wikipedia.org/wiki/Rate_ratio

    In epidemiology, a rate ratio, sometimes called an incidence density ratio or incidence rate ratio, is a relative difference measure used to compare the incidence rates of events occurring at any given point in time. It is defined as:

  6. Prevalence - Wikipedia

    en.wikipedia.org/wiki/Prevalence

    Prevalence is a term that means being widespread and it is distinct from incidence. Prevalence is a measurement of all individuals affected by the disease at a particular time, whereas incidence is a measurement of the number of new individuals who contract a disease during a

  7. Incidence (geometry) - Wikipedia

    en.wikipedia.org/wiki/Incidence_(geometry)

    In geometry, an incidence relation is a heterogeneous relation that captures the idea being expressed when phrases such as "a point lies on a line" or "a line is contained in a plane" are used. The most basic incidence relation is that between a point, P , and a line, l , sometimes denoted P I l .

  8. Rare disease - Wikipedia

    en.wikipedia.org/wiki/Rare_disease

    Estimating the incidence and prevalence of rare diseases is a complex process due to their wide range of prevalence rates. Rare diseases with higher prevalences can be estimated through a screening panel or patient registries, while diseases which are exceedingly rare may only be able to be estimated through a multi-step nationwide reporting ...

  9. Angle of incidence (optics) - Wikipedia

    en.wikipedia.org/wiki/Angle_of_incidence_(optics)

    The angle of incidence, in geometric optics, is the angle between a ray incident on a surface and the line perpendicular (at 90 degree angle) to the surface at the point of incidence, called the normal. The ray can be formed by any waves, such as optical, acoustic, microwave, and X-ray. In the figure below, the line representing a ray makes an ...