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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.
A hull is the watertight body of a ship, boat, submarine, or flying boat. The hull may open at the top (such as a dinghy), or it may be fully or partially covered with a deck. Atop the deck may be a deckhouse and other superstructures, such as a funnel, derrick, or mast. The line where the hull meets the water surface is called the waterline.
A graphical representation of the dimensions used to describe a ship. f is the freeboard.. In sailing and boating, a vessel's freeboard is the distance from the waterline to the upper deck level, measured at the lowest point of sheer where water can enter the boat or ship. [1]
The largest junks (5,000 liao) may have a hull length twice that of Quanzhou ship (1,000 liao), [39] that is 68 metres (223.1 ft). [33] However, the norm size for trading junks pre-1500 was most likely around 20–30 metres (65.6–98.4 ft) long, with the length of 30 metres (98.4 ft) only becoming the norm after 1500 CE.
In time series analysis, the moving-average model (MA model), also known as moving-average process, is a common approach for modeling univariate time series. [ 1 ] [ 2 ] The moving-average model specifies that the output variable is cross-correlated with a non-identical to itself random-variable.
A Swordfish hull was obtained from Fairey Marine via a local boat builder. They modified the hull moving the position of the mast, cutting a slot and fitting a keel box. Several members of the Locks Sailing club were interested in this project and formed a committee with Fairey Marine, resulting in the 'committee modified Swordfish'.
The notation ARMAX(p, q, b) refers to a model with p autoregressive terms, q moving average terms and b exogenous inputs terms. The last term is a linear combination of the last b terms of a known and external time series d t {\displaystyle d_{t}} .
All the Indonesia Navy (Indonesian: Tentara Nasional Indonesia-Angkatan Laut, TNI-AL) vessels are named with the prefix KRI (Kapal Perang Republik Indonesia or Naval Vessel of the Republic of Indonesia). Smaller sized boats with light armaments usually have the prefix KAL (Kapal Angkatan Laut or Naval Vessel of the Indonesian Navy). The classes ...