X-bar chart

X-bar chart

In industrial statistics, the X-bar chart is a type of control chart that is used to monitor the arithmetic means of successive samples of constant size, n. This type of control chart is used for characteristics that can be measured on a continuous scale, such as weight, temperature, thickness etc.

For the purposes of control limit calculation, the sample means are assumed to be normally distributed, an assumption justified by the Central Limit Theorem.

The X-bar chart is often used in conjunction with a variation chart such as the R-chart or s-chart. The average sample range, R, or the average sample standard deviation, s, can be used to derive the X-bar chart's control limits.


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • bar chart — bar charts N COUNT A bar chart is a graph which uses parallel rectangular shapes to represent changes in the size, value, or rate of something or to compare the amount of something relating to a number of different countries or groups. [mainly… …   English dictionary

  • bar chart — n. BAR GRAPH * * * …   Universalium

  • bar chart — also bar graph n a picture of boxes of different heights, in which each box represents a different amount or quantity …   Dictionary of contemporary English

  • bar chart — bar′ chart n. sta bar graph …   From formal English to slang

  • bar chart — (also bar graph) ► NOUN ▪ a diagram in which different quantities are represented by rectangles of varying height …   English terms dictionary

  • bar chart — n. BAR GRAPH …   English World dictionary

  • Bar Chart —   [engl.], Balkendiagramm …   Universal-Lexikon

  • bar chart — noun a chart with bars whose lengths are proportional to quantities • Syn: ↑bar graph • Hypernyms: ↑chart • Hyponyms: ↑histogram * * * noun Etymology: bar ( …   Useful english dictionary

  • Bar chart — See also: Histogram Example of a bar chart, with Country as the discrete data set. A bar chart or bar graph is a chart with rectangular bars with lengths proportional to the values that they represent. The bars can be plotted vertically or… …   Wikipedia

  • bar chart — A chart that graphs the high, low, and settlement prices for a specific trading session over a given period of time. Chicago Board of Trade glossary A graphic representation of price movement disclosing the high, low, close, and sometimes the… …   Financial and business terms

  • Bar Chart — A style of chart used by some technical analysts, on which, as illustrated below, the top of the vertical line indicates the highest price a security traded at during the day, and the bottom represents the lowest price. The closing price is… …   Investment dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”