If 
use the gradient vector 
to find the tangent line to the level curve 
at the point 
Definitions:
Collinearity
A statistical phenomenon where two or more predictor variables in a multiple regression model are highly correlated, making it difficult to isolate the individual effects of each predictor.
Odds Ratio
The odds that y = 1 given that one of the independent variables increased by one unit (odds1) divided by the odds that y = 1 given no change in the values for the independent variables (odds0); that is, Odds ratio = odds1 / odds0.
Estimated Income
An estimate of the revenue anticipated to be generated during a certain timeframe.
Yearly Income
The total pre-tax earnings received by an individual or household over the course of one year from all sources combined.
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