# Shared Flashcard Set

## Details

QBA II
Monroe Baylor QBA II test 1
20
Mathematics
02/11/2010

Term
 Simple Linear Regression
Definition
 analysis of the equational relationship between X and Y.
Term
 Slope, ß1
Definition
 , has a t distribution which standardizes its value to see if it is significantly different from 0.
Term
 Y-Intercept
Definition
 , ß0, is not interpreted.
Term
 Correlation Coefficient,
Definition
 ,r, indicates direction and strength of the LINEAR relationship between X and Y.
Term
 Coefficient of Determination
Definition
 R2, the ratio of explained variation in Y to the total variation.
Term
 Standard Error
Definition
 will be smaller for better predictive equations.
Term
 Correlation analysis
Definition
 is the study of the nature and degree of the relationship between variables.
Term
 Extrapolation
Definition
 is using Xs beyond the range of the given Xs to predict Y. This can cause large errors in prediction.
Term
 Relationship of slope to the correlation coefficient
Definition
 signs are the same.
Term
 Multicollinearity:
Definition
 when Xs are highly correlated this gives redundant information.
Term
 Heteroscedasticity
Definition
 - non-constant variance in the residuals
Term
 Outlier
Definition
 atypical values in a data set.
Term
 Non-linear relationships-
Definition
 curvilinear patterns or logarithmic relationships
Term
 Multiple regression analysis
Definition
 includes one dependent variable and more than one independent.
Term
 Stepwise
Definition
 tries all combinations of variables and produces the best predictors in order of their predictive power.
Term
 Artificially Inflated R-squared
Definition
 occurs when there are too many predictors and not enough samples.
Term
 Normal plots
Definition
 should produce a nearly straight line without outliers.
Term
 T distribution vs. F distribution
Definition
 : t is used to test the individual coefficients where F tests the overall model.
Term
 Residuals are the differences in the observed value of Y at a given X and the predicted value.
Definition
 :D
Term
 Studentized Residuals
Definition
 should fall within +/- 3 in order to be considered normal values.
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