Piecewise linear model: Let x be a known constant, and suppose that a dependent variable y is related to an independent variable x1 as follows:

In other words, y and x1 are linearly related, but different lines are appropriate depending on whether Define a new independent variable x2 by

Also define Find a multiple regression model involving y, x1, x2, β0, β1, β2, and β3 that expresses the relationship described here.

Week1-IntroductiontoEnvironmentalHealth KeyTerms • Environment o Thecomplexofphysical,chemicalandbioticfactors(climate,soiland livingthings)thatactuponanorganismoranecologicalcommunity andultimatelydetermineitsformandsurvival o SocialenvironmentàAnindividual’senvironmentcanalsodependon...