emmynimmy
  • emmynimmy
Which is the exponential regression equation?
Mathematics
schrodinger
  • schrodinger
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emmynimmy
  • emmynimmy
aaronq
  • aaronq
Look here, near the bottom of the page http://www.zweigmedia.com/RealWorld/calctopic1/regression.html
emmynimmy
  • emmynimmy
I need to know how to do it. I've tried everything.

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aaronq
  • aaronq
The general form of the exponential function is \(y=Ar^x\) if you take the logarithm of all the y values, you get a straight line. \(log(y)=m*x+b\) find the slope (m) and the intercept (b). then \(r=10^m\) and \(A=10^b\)
aaronq
  • aaronq
so the slope is \(m=\dfrac{log(y_2)-log(y_1)}{x_2-x_1}\) can you find \(b\)?
emmynimmy
  • emmynimmy
y = 3.807 1.042x ?
aaronq
  • aaronq
sorry, i'm not getting notifications. so i kept getting weird values, so i graphed it on excel with \((x,~log(y))\) coordinates. i got y = 0.0177x + 0.5691 so \(\sf r=10^{0.0177}=1.041597671\) and \(\sf A=10^{0.5691}=3.70766084\) so the equation is \(\sf y=3.71*1.042^x\) which is very close to the last option

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