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standard deviation |
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standard deviationIn statistics, a measure (symbol ςor s) of the spread of data. The deviation (difference) of each of the data items from the mean is found, and their values squared. The mean value of these squares is then calculated. The standard deviation is the square root of this mean. If n is the number of items of data, x is the value of each item, and μ is the mean value, the standard deviation ςmay be given by the formula where Σ indicates that the differences between the value of each item of data and the mean should be summed. To simplify the calculations, the formula may be rearranged to As a result, it becomes necessary only to calculate Σx and Σx2. For example, if the ages of a set of children were 4, 4.5, 5, 5.5, 6, 7, 9, and 11, Σx would be 52, μ would be 52/n = 52/8 = 6.5, and Σx2 would be Therefore, the standard deviation ςwould be How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The results for StdDev are shifted in contrast to MaxDist and higher convergence rates are reached (Figure 2(a)). Retention, and Transfers of Critical Thinking in Experiment 1 Measures Effects Audio With Organizers A (n = 16) Mean Stddev Evaluations A+C vs. Firm risk is controlled for using the standard deviation of stock returns for the period 220 to 21 days prior to the announcement date, STDDEV, and by dummy variables for Moody's bond ratings A or higher, Baa, Ba, and B. |
Stddev |
STD MSL STD recorder STD SSM(ARM) STD World of Resources Network Std's Std's Std's Std's STD-CHG std. STD/AIDS Cooperative Central Laboratory STD/AIDS Counseling and Training Services STD3S STDA Stdafx Stdafx.h STDAS STDAT STDAUX STDB STDBC STDBY STDC STDCC STDCE STDCF STDD Stddev STDDSSTDE Stderr Stderr Stdev Stdev Stdev Stdev Stdev Stdev STDF STDFE STDG STDGP STDH StdHEP STDI Stdin Stdin Stdio Stdio Stdio.h Stdio.h STDJ STDL STDLTBBB STDM STDM STDMA STDMG | ||||||||
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