Search results
Results From The WOW.Com Content Network
Comparison of positive and negative birefringence : In positive birefringence (figure 1), the ordinary ray (p-polarisation in this case w.r.t. magenta-coloured plane of incidence), perpendicular to optic axis A is the fast ray (F) while the extraordinary ray (s-polarisation in this case and parallel to optic axis A) is the slow ray (S).
The Satisfaction with Life Index was created in 2007 by Adrian G. White, an analytic social psychologist at the University of Leicester, using data from a metastudy. [1] It is an attempt to show life satisfaction in different nations.
The positive predictive value (PPV), or precision, is defined as = + = where a "true positive" is the event that the test makes a positive prediction, and the subject has a positive result under the gold standard, and a "false positive" is the event that the test makes a positive prediction, and the subject has a negative result under the gold standard.
When the true prevalences for the two positive variables are equal as assumed in Fleiss kappa and F-score, that is the number of positive predictions matches the number of positive classes in the dichotomous (two class) case, the different kappa and correlation measure collapse to identity with Youden's J, and recall, precision and F-score are ...
Sample of a well maintained data [clarification needed]. In statistics and research design, an index is a composite statistic – a measure of changes in a representative group of individual data points, or in other words, a compound measure that aggregates multiple indicators.
Manufacturers' new orders for non-defense capital goods — As stated above, new orders lead the business cycle because increases in orders usually mean positive changes in actual production and perhaps rising demand. This measure is the producer's counterpart of new orders for consumer goods/materials component (#3).
An n th root of a number x, where n is a positive integer, is any of the n real or complex numbers r whose nth power is x: =. Every positive real number x has a single positive nth root, called the principal nth root, which is written .
Color indices of distant objects are usually affected by interstellar extinction, that is, they are redder than those of closer stars. The amount of reddening is characterized by color excess , defined as the difference between the observed color index and the normal color index (or intrinsic color index ), the hypothetical true color index of ...