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External validity is the validity of applying the conclusions of a scientific study outside the context of that study. [1] In other words, it is the extent to which the results of a study can generalize or transport to other situations, people, stimuli, and times.
The example above is the simplest kind of contingency table, a table in which each variable has only two levels; this is called a 2 × 2 contingency table. In principle, any number of rows and columns may be used. There may also be more than two variables, but higher order contingency tables are difficult to represent visually.
Angular momentum operators are self-adjoint operators j x, j y, and j z that satisfy the commutation relations [,] =,, {,,}, where ε klm is the Levi-Civita symbol.Together the three operators define a vector operator, a rank one Cartesian tensor operator, = (,,).