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These trains were different from the test train couple used during the ICTS testing in 1983. There are a total of 150 Mark I cars: 114 dating from 1984–1986, which have run an average of more than 3.2 million km apiece; 16 added in 1991 for the Scott Road extension; and 20 added in 1994 for the King George extension.
D010366. The peak expiratory flow ( PEF ), also called peak expiratory flow rate ( PEFR) and peak flow measurement, [ 1] is a person's maximum speed of expiration, as measured with a peak flow meter, a small, hand-held device used to monitor a person's ability to breathe out air. It measures the airflow through the bronchi and thus the degree ...
"The Flesch–Kincaid" (F–K) reading grade level was developed under contract to the U.S. Navy in 1975 by J. Peter Kincaid and his team. [1] Related U.S. Navy research directed by Kincaid delved into high-tech education (for example, the electronic authoring and delivery of technical information), [2] usefulness of the Flesch–Kincaid readability formula, [3] computer aids for editing tests ...
Researchers from Lund University have found that a new blood test called PrecivityAD2 is about 90% accurate in identifying Alzheimer’s disease in people experiencing cognitive symptoms. As with ...
Brian Atwater, a U.S. Geological Survey scientist emeritus, shows off tsunami-deposited mud. COPALIS BEACH, WASH. — When Japan issued its first-ever “megaquake” warning last week, Harold ...
In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.
In the language of statistics: Accuracy is a description of systematic errors, a measure of bias. Precision is a description of random errors, a measure of variability. In the context of observations made on a ratio or interval scale, a statistical sample can be said to be accurate if its average is close to the true value of the quantity being ...
Repeatability. Repeatability or test–retest reliability[ 1] is the closeness of the agreement between the results of successive measurements of the same measure, when carried out under the same conditions of measurement. [ 2] In other words, the measurements are taken by a single person or instrument on the same item, under the same ...