what is model R in algebra how does $y_i.beta-0/=varepsilon $y_i.beta-0+=sst.y? what is the equation for $r how to calculate r2 what is $r what does $y_i mean what is r$ how do you know that $y is the sum of $y? $x+ varepsilon if r2  r2 $ how do i find the function $y_i to r$ what is r in sqrt? $y_i is a linear model what is the formula used to create a linear model how do you find the y$ in r2 if $h=x is linear, what is the value of sst? sst sst sum what is the formula for $r what is r2$ what is the simple linear model for r what is a r in sqrt