why is the ratio of eb$ for some variables very large? why is the ratio of $a$ a variable what variables are used for different trips? what are the dependent and independent variables of a trip when the lrr is a dependent variable what is b$ why is the ratio of $b$ and $eb$ for some variables very large? why is the ratio of $b$ and $eb$ for some variables very large? which variable is a dependent variable of mode of transportation? what is the relation between $b$ and $ebe$ why is the ratio of $eb$ for some variables very large? why is the ratio a large why is the ratio of eb-a/p/ large why is the correlation of b and e extremely large which variable is dependent why is the correlation between b$ and eb$ extremely large why are variables such large how does mode of travel affect travel why is the ratio of b$ and eb= large what is the independent variable of car why is the ratio of $eb$