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" This term is generally used in statistics and is the square root of the mean of the squares of the percentage variations up and down, without regard to sign, of all the years in the record. "
Water Works Practice - Page 56
by American Water Works Association - 1925 - 790 pages
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Quarterly Journal of the Chemical Society of London, Volume 113, Part 1

Chemical Society (Great Britain) - 1918 - 480 pages
...we are considering is represented by e-Ťo*/'"* where e is the base of natural logarithm. Now if c is the square root of the mean of the squares of the speeds, we have c2=|F'2, and the required fraction becomes (Since there are ions of different equivalent...
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The Story of the Sun

Sir Robert Stawell Ball, Robert Stawell Ball - 1893 - 422 pages
...matter, I ought perhaps to explain that by average velocity we mean that particular quantity which is the square root of the mean of the squares of the actual velocities. In the case of oxygen the mean velocity of the molecule at the same temperature...
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Electrical and Magnetic Calculations: For the Use of Electrical Engineers ...

Albert Algernon Atkinson - 1902 - 336 pages
...and is that which is available for producing heat if applied to a resistance. The effective pressure is the square root of the mean of the squares of the successive pressures during one-half a revolution of the pressure coil, because the successive heats...
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Electricity Meters: A Treatise on the General Principles, Construction, and ...

Henry G. Solomon - 1906 - 412 pages
...in an alternating current system c and v denote the effective or virtual values (the virtual value is the square root of the mean of the squares of the values during half a period) of the current and pressure as given by an alternating current ammeter...
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A Text-book of Experimental Psychology

Charles Samuel Myers - 1909 - 458 pages
...Standard Deviation. — The " standard deviation " or the " mean square error," z denoted by the letter a, is the square root of the mean of the squares of the individual variations from the mean (exp. 85). [The Coefficient of Variation. — The deviations of...
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The Observatory, Volume 33

1910 - 526 pages
...magnitude is expressed by an exponential curve. ASE * The standard deviation of a group of quantities is the square root of the mean of the squares of the deviations of each from the meim of the group. It may be regarded as a generalization of the mean error...
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The Observatory, Volume 33

1910 - 528 pages
...magnitude is expressed by an exponential curve. ASE * The standard deviation of a group of quantities is the square root of the mean of the squares of the deviations of each from the mean of the group. It may be regarded as a generalization of the mean error...
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A Text-book of Experimental Psychology: With Laboratory Exercises

Charles S. Myers - 1911 - 370 pages
...Standard Deviation. — The 'standard deviation' or the ' mean square error2,' denoted by the letter a, is the square root of the mean of the squares of the individual variations from the mean (exp. 85). [The Coefficient of Variation. — The deviations of...
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The Theory of Measurements

Albert de Forest Palmer - 1912 - 270 pages
...A=0.3183-- (19) CO 37. The Mean Error. — The mean error M of a single measurement in a given series is the square root of the mean of. the squares of the errors in the system determined by the given measurements. Expressed mathematically _. (20) This equation...
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The Americana: A Universal Reference Library, Comprising the Arts ..., Volume 11

Frederick Converse Beach, George Edwin Rines - 1912 - 928 pages
...element of volume dr^edxdy being gpdr, the moment about the X-axis will be • •- ' • (to) L'where KZ is the square root of the mean of the squares of the distances of the elements from the X-axis, or the so-cilled radius of gyration of the area of flotation...
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