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Tinkertoy Models Produce New Geometric InsightsQuanta MagazineBy “simplest,” mathematicians want to know two things: How many variables does it need? And what's the highest power of those variables? For example, the simplest equation that describes the circle requires two variables raised to the second power. 

Music videos become tool to boost learning, test scoresThe StateBut due in part to Muzology, a new program that sets math principles to popular music, Nuchols's students are excited about prealgebra. The program was tested in Knoxville and as of this school year, is being used in ... After two years of being used ...and more » 
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Data Transformations Reference  Amazon Machine Learning
The ngram transformation takes a text variable as input and produces strings corresponding to sliding a window of (userconfigurable) n words, generating outputs in the process. For example, consider the text string "I really enjoyed reading this book".
Correlation  Statistical Engineering
Correlation measures the strength of a linear relationship between two variables. It's that nevermentioned, oftenignored, qualifier that can trip you up.
West Texas A & M Virtual Math Lab  wtamu.edu
After completing this tutorial, you should be able to: Know if an ordered pair is a solution to a system of linear equations in two variables or not.
Algebra  Linear Systems with Two Variables
In this section we will solve systems of two equations and two variables. We will use the method of substitution and method of elimination to solve the systems in this section. We will also introduce the concepts of inconsistent systems of equations and dependent systems of equations.
Correlation: The Relationship of Two Variables
Definition of a Scatterplot: A scatterplot is a statistical graphic that displays the STRENGTH, DIRECTION and SHAPE of the relationship between two variables.. A scatterplot requires two scores from the SAME individuals. These scores are normally identified as X and Y.
Function of several real variables  Wikipedia
In mathematical analysis, and applications in geometry, applied mathematics, engineering, natural sciences, and economics, a function of several real variables or real multivariate function is a function with more than one argument, with all arguments being real variables. This concept extends the idea of a function of a real variable to several variables.
r  Calculate correlation for more than two variables ...
I use the following method to calculate a correlation of my dataset: cor( var1, var2, method = "method") But I like to create a correlation matrix of 4 different variables. What's the easiest way...
Swap two variables using XOR – BetterExplained
Most people would swap two variables x and y using a temporary variable, like this: tmp = x x = y y = tmp Here’s a neat programming trick to swap two values without needing a temp:
3 Ways to Solve Systems of Algebraic Equations Containing ...
How to Solve Systems of Algebraic Equations Containing Two Variables. In a "system of equations," you are asked to solve two or more equations at the same time. When these have two different variables in them, such as x and y, or a and b,...
Ventilation/perfusion ratio  Wikipedia
In respiratory physiology, the ventilation/perfusion ratio (V̇/Q̇ ratio or V/Q ratio) is a ratio used to assess the efficiency and adequacy of the matching of two variables: . V̇ or V – ventilation – the air that reaches the alveoli Q̇ or Q – perfusion – the blood that reaches the alveoli via the capillaries The V/Q ratio can therefore be defined as the ratio of the amount of air ...
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