Journal of the Society for Industrial and Applied Mathematics: Series B, Numerical Analysis, Vol. 1 (1964), pp. 137-163 (27 pages) ...
Functions of two variables can be visualized in many ways: heat maps in 2D, contour curves in 2D, wireframes in 3D, surfaces in 3D. We begin by defining a function of two variables, building an array ...
Questions that ask respondents to "choose all that apply" from a set of items occur frequently in surveys. Categorical variables that summarize this type of survey data are called both pick any/c ...
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