chapter 12 Flashcards
(16 cards)
What is a linear relationship?
An association between two variables whereby the strength and nature of the relationship remains the same over the range of both variables.
What is a curvilinear relationship?
A relationship between two variables whereby the strength and/or direction of their relationship changes over the range of both variables.
What is covariation?
The amount of change in one variable that is consistently related to the change in another variable of interest.
What is a scatter diagram?
A graphic plot of the relative position of two variables using a horizontal and a vertical axis to represent the values of the respective variables.
What is the Pearson correlation coefficient?
A statistical measure of the strength of a linear relationship between two metric variables.
What is the coefficient of determination (r2)?
A number measuring the proportion of variation in one variable accounted for by another, varying from 0.0 to 1.00.
What is the Spearman rank order correlation coefficient?
A statistical measure of the linear association between two variables where both have been measured using ordinal (rank order) scales.
What is bivariate regression analysis?
A statistical technique that analyzes the linear relationship between two variables by estimating coefficients for an equation for a straight line.
What is the least squares procedure?
A regression approach that determines the best-fitting line by minimizing the vertical distances of all the points from the line.
What is unexplained variance?
The amount of variation in the dependent variable that cannot be accounted for by the combination of independent variables.
What is ordinary least squares?
A statistical procedure that estimates regression equation coefficients that produce the lowest sum of squared differences between the actual and predicted values of the dependent variable.
What is a regression coefficient?
An indicator of the importance of an independent variable in predicting a dependent variable.
What is multiple regression analysis?
A statistical technique which analyzes the linear relationship between a dependent variable and multiple independent variables by estimating coefficients for the equation for a straight line.
What is a beta coefficient?
An estimated regression coefficient that has been recalculated to have a mean of 0 and a standard deviation of 1.
What is the model F statistic?
A statistic that compares the amount of variation in the dependent measure explained by the independent variables to the unexplained or error variance.
What is multicollinearity?
A situation in multiple regression analysis where independent variables are highly correlated.
