Term

Definition
analysis of the equational relationship between X and Y. 


Term

Definition
, has a t distribution which standardizes its value to see if it is significantly different from 0. 


Term

Definition
, ß0, is not interpreted. 


Term

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

Definition
will be smaller for better predictive equations. 


Term

Definition
is the study of the nature and degree of the relationship between variables. 


Term

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


Term

Definition
when Xs are highly correlated this gives redundant information. 


Term

Definition
 nonconstant variance in the residuals 


Term

Definition
atypical values in a data set. 


Term
Nonlinear relationships 

Definition
curvilinear patterns or logarithmic relationships 


Term
Multiple regression analysis 

Definition
includes one dependent variable and more than one independent. 


Term

Definition
tries all combinations of variables and produces the best predictors in order of their predictive power. 


Term
Artificially Inflated Rsquared 

Definition
occurs when there are too many predictors and not enough samples. 


Term

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


Term

Definition
should fall within +/ 3 in order to be considered normal values. 

