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In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...
Snellen chart. The Snellen chart, which dates back to 1862, is also commonly used to estimate visual acuity.A Snellen score of 6/6 (20/20), indicating that an observer can resolve details as small as 1 minute of visual angle, corresponds to a LogMAR of 0 (since the base-10 logarithm of 1 is 0); a Snellen score of 6/12 (20/40), indicating an observer can resolve details as small as 2 minutes of ...
Pareto chart. A Pareto chart is a type of chart that contains both bars and a line graph, where individual values are represented in descending order by bars, and the cumulative total is represented by the line. The chart is named for the Pareto principle, which, in turn, derives its name from Vilfredo Pareto, a noted Italian economist.
A candlestick chart (also called Japanese candlestick chart or K-line) is a style of financial chart used to describe price movements of a security, derivative, or currency . While similar in appearance to a bar chart, each candlestick represents four important pieces of information for that day: open and close in the thick body, and high and ...
The arithmetic mean of a set of numbers x 1, x 2, ..., x n is typically denoted using an overhead bar, ¯. [ note 1 ] If the numbers are from observing a sample of a larger group , the arithmetic mean is termed the sample mean ( x ¯ {\displaystyle {\bar {x}}} ) to distinguish it from the group mean (or expected value ) of the underlying ...
High availability ( HA) is a characteristic of a system that aims to ensure an agreed level of operational performance, usually uptime, for a higher than normal period. [ 1] Modernization has resulted in an increased reliance on these systems. For example, hospitals and data centers require high availability of their systems to perform routine ...
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A burndown chart or burn down chart is a graphical representation of work left to do versus time. [ 1] The outstanding work (or backlog) is often on the vertical axis, with time along the horizontal. A burn down chart is a run chart of remaining work. It is useful for predicting when all of the work will be completed.