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¯ ¯ ¯ for monitoring the process mean where x ¯ ¯ {\displaystyle {\bar {\bar {x}}}} and R ¯ {\displaystyle {\bar {R}}} are the estimates of the long-term process mean and range established during control-chart setup and A 2 , D 3 , and D 4 are sample size-specific anti-biasing constants.
The X-bar chart is always used in conjunction with a variation chart such as the ¯ and R chart or ¯ and s chart. The R-chart shows sample ranges (difference between the largest and the smallest values in the sample), while the s-chart shows the samples' standard deviation. The R-chart was preferred in times when calculations were performed ...
A double vertical bar || or ‖ is the standard caesura mark in English literary criticism and analysis. It marks the strong break or caesura common to many forms of poetry , particularly Old English verse .
X bar, x̄ (or X̄) or X-bar may refer to: X-bar theory, a component of linguistic theory; Arithmetic mean, a commonly used type of average; An X-bar, a rollover protection structure; Roman numeral 10,000 in vinculum form
Some variants of X-bar notation use a double-bar (or double-prime) to represent phrasal-level units. X-bar theory derives its name from the overbar. One of the core proposals of the theory was the creation of an intermediate syntactic node between phrasal (XP) and unit (X) levels; rather than introduce a different label, the intermediate unit ...
Double factorial: if n is a positive integer, n!! is the product of all positive integers up to n with the same parity as n, and is read as "the double factorial of n". 3. Subfactorial : if n is a positive integer, ! n is the number of derangements of a set of n elements, and is read as "the subfactorial of n".
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The "X" in the X-bar theory is equivalent to a variable in mathematics: It can be substituted by syntactic categories such as N, V, A, and P. These categories are lexemes and not phrases : The "X-bar" is a grammatical unit larger than X, thus than a lexeme, and the X-double-bar (=XP) outsizes the X(-single)-bar.