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Schaefer published a fishery equilibrium model based on the Verhulst model with an assumption of a bi-linear catch equation, often referred to as the Schaefer short-term catch equation: (,) = where the variables are; H, referring to catch (harvest) over a given period of time (e.g. a year); E, the fishing effort over the given period; X, the ...
Individual fishing quotas (IFQs), also known as "individual transferable quotas" (ITQs), are one kind of catch share, a means by which many governments regulate fishing. The regulator sets a species-specific total allowable catch (TAC), typically by weight and for a given time period. A dedicated portion of the TAC, called quota shares, is then ...
A variable measured in discrete time can be plotted as a step function, in which each time period is given a region on the horizontal axis of the same length as every other time period, and the measured variable is plotted as a height that stays constant throughout the region of the time period. In this graphical technique, the graph appears as ...
The Gompertz curve or Gompertz function is a type of mathematical model for a time series, named after Benjamin Gompertz (1779–1865). It is a sigmoid function which describes growth as being slowest at the start and end of a given time period.
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“Not all change is great,” said former Red Sox first baseman Kevin Youkilis on X. “The best part of baseball is when the guy least expected to get the big hit delivers at the end of the game.
The term cultural lag refers to the notion that culture takes time to catch up with technological innovations, and the resulting social problems that are caused by this lag. In other words, cultural lag occurs whenever there is an unequal rate of change between different parts of culture causing a gap between material and non-material culture.
The number of exits is up 19% from the more than 1,500 departures during the same period last year, which was the previous year-to-date record. ... The massive stock market gains of the past two ...