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In forestry, periodic annual increment (PAI) is the change in the size of a tree between the beginning and ending of a growth period, divided by the number of years that was designated as the growing period. [1] For sigmoid growth, the graph of PAI increases rapidly and then quickly declines, approaching zero. PAI may go negative if a tree ...
In biology, the annual cycle for plants and animals details behavioral and chemical changes that take place as the seasons advance. [1] In business, a business cycle refers to the way modelling and analysis is applied to the periodic development and marketing of new products and services.
The word is derived from the Greek φαίνω (phainō), "to show, to bring to light, make to appear" [6] + λόγος (), amongst others "study, discourse, reasoning" [7] and indicates that phenology has been principally concerned with the dates of first occurrence of biological events in their annual cycle.
Some function as tax shelters (for example, flexible spending accounts, 401(k)'s, 403(b)'s). Fringe benefits are also thought of as the costs of keeping employees other than salary. These benefit rates are typically calculated using fixed percentages that vary depending on the employee’s classification and often change from year to year.
In time series data, seasonality refers to the trends that occur at specific regular intervals less than a year, such as weekly, monthly, or quarterly. Seasonality may be caused by various factors, such as weather, vacation, and holidays [1] and consists of periodic, repetitive, and generally regular and predictable patterns in the levels [2] of a time series.
The algorithm changes impacted users that browse the platform without signing into an account, Huffman added. Reddit misses estimates for daily active unique visitors in fourth quarter, shares tumble
The secular variation of a time series is its long-term, non-periodic variation (see Decomposition of time series).Whether a variation is perceived as secular or not depends on the available timescale: a variation that is secular over a timescale of centuries may be a segment of what is, over a timescale of millions of years, a periodic variation.
Solar cycles are nearly periodic 11-year changes in the Sun's activity that are based on the number of sunspots present on the Sun's surface. The first solar cycle conventionally is said to have started in 1755.
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