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  2. Social discount rate - Wikipedia

    en.wikipedia.org/wiki/Social_discount_rate

    Social discount rate (SDR) is the discount rate used in computing the value of funds spent on social projects. Discount rates are used to put a present value on costs and benefits that will occur at a later date.

  3. Stochastic discount factor - Wikipedia

    en.wikipedia.org/wiki/Stochastic_discount_factor

    The concept of the stochastic discount factor (SDF) is used in financial economics and mathematical finance.The name derives from the price of an asset being computable by "discounting" the future cash flow ~ by the stochastic factor ~, and then taking the expectation. [1]

  4. Discounting - Wikipedia

    en.wikipedia.org/wiki/Discounting

    In finance, discounting is a mechanism in which a debtor obtains the right to delay payments to a creditor, for a defined period of time, in exchange for a charge or fee. [1]

  5. World Geodetic System - Wikipedia

    en.wikipedia.org/wiki/World_Geodetic_System

    The World Geodetic System (WGS) is a standard used in cartography, geodesy, and satellite navigation including GPS.The current version, WGS 84, defines an Earth-centered, Earth-fixed coordinate system and a geodetic datum, and also describes the associated Earth Gravitational Model (EGM) and World Magnetic Model (WMM).

  6. Net present value - Wikipedia

    en.wikipedia.org/wiki/Net_present_value

    Each cash inflow/outflow is discounted back to its present value (PV). Then all are summed such that NPV is the sum of all terms: = (+) where: t is the time of the cash flow; i is the discount rate, i.e. the return that could be earned per unit of time on an investment with similar risk

  7. Universal Transverse Mercator coordinate system - Wikipedia

    en.wikipedia.org/wiki/Universal_Transverse...

    The Universal Transverse Mercator (UTM) is a map projection system for assigning coordinates to locations on the surface of the Earth.Like the traditional method of latitude and longitude, it is a horizontal position representation, which means it ignores altitude and treats the earth surface as a perfect ellipsoid.

  8. Isochrone map - Wikipedia

    en.wikipedia.org/wiki/Isochrone_map

    Isochrone maps have been used in transportation planning since at least 1887. [21] [22] Isochrone maps in the context of transport planning are essentially maps of accessibility where travel time is used as the cost metric.

  9. Incidence structure - Wikipedia

    en.wikipedia.org/wiki/Incidence_structure

    Any graph (which need not be simple; loops and multiple edges are allowed) is a uniform incidence structure with two points per line. For these examples, the vertices of the graph form the point set, the edges of the graph form the line set, and incidence means that a vertex is an endpoint of an edge.