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  2. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The issue spans the changeover; the date heading reads: "From Tuesday September 1, O.S. to Saturday September 16, N.S. 1752". [1] Old Style ( O.S.) and New Style ( N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in ...

  3. Year-to-date - Wikipedia

    en.wikipedia.org/wiki/Year-to-date

    YTD measures are more sensitive to early changes than late changes. Contrast YTD with the concept of 12-months-ending (or Year-ending), which are more resistant to seasonal influences. Example: to calculate year-to-date Invoicing for a company, invoice totals for each previous month of the current year are added to total invoices for the ...

  4. Moving average - Wikipedia

    en.wikipedia.org/wiki/Moving_average

    In statistics, a moving average ( rolling average or running average or moving mean [1] or rolling mean) is a calculation to analyze data points by creating a series of averages of different selections of the full data set. Variations include: simple, cumulative, or weighted forms. Mathematically, a moving average is a type of convolution.

  5. Common Era - Wikipedia

    en.wikipedia.org/wiki/Common_Era

    Common Era. Common Era ( CE) and Before the Common Era ( BCE) are year notations for the Gregorian calendar (and its predecessor, the Julian calendar ), the world's most widely used calendar era. Common Era and Before the Common Era are alternatives to the original Anno Domini (AD) and Before Christ (BC) notations used for the same calendar era.

  6. Duration (finance) - Wikipedia

    en.wikipedia.org/wiki/Duration_(finance)

    v. t. e. In finance, the duration of a financial asset that consists of fixed cash flows, such as a bond, is the weighted average of the times until those fixed cash flows are received. When the price of an asset is considered as a function of yield, duration also measures the price sensitivity to yield, the rate of change of price with respect ...

  7. Anno Domini - Wikipedia

    en.wikipedia.org/wiki/Anno_Domini

    The term anno Domini is Medieval Latin and means "in the year of the Lord" [1] but is often presented using "our Lord" instead of "the Lord", [2] [3] taken from the full original phrase " anno Domini nostri Jesu Christi ", which translates to "in the year of our Lord Jesus Christ ". The form "BC" is specific to English, and equivalent ...

  8. Exponential growth - Wikipedia

    en.wikipedia.org/wiki/Exponential_growth

    Exponential growth. Exponential growth is a process that increases quantity over time at an ever-increasing rate. It occurs when the instantaneous rate of change (that is, the derivative) of a quantity with respect to time is proportional to the quantity itself. Described as a function, a quantity undergoing exponential growth is an exponential ...

  9. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.