powherful Posted September 28, 2011 Report Share Posted September 28, 2011 Hey there, In a natural exponential of format f(x)=a*e^(bx+c)+d What does a b c and d control, how can they be manipulated to fit data?? Please define, danke Reply Link to post Share on other sites More sharing options...
CkyBlue Posted October 3, 2011 Report Share Posted October 3, 2011 "a" is the vertical stretch or compression"b" is the horizontal stretch or compression"c" is the horizontal translation"d" is the vertical translationI am assuming that you are talking about portfolios if you are talking about fitting data and all that. Regression on your GDC will cover that...An exponential function can be defined as a function whose successive first differences differ by the multiplication of "a". It has no restricted domain but a range of greater or less than "d" looking if the function is vertically flipped or not I guess...Look it up if you're not sure... 2 Reply Link to post Share on other sites More sharing options...
powherful Posted October 3, 2011 Author Report Share Posted October 3, 2011 "a" is the vertical stretch or compression "b" is the horizontal stretch or compression "c" is the horizontal translation "d" is the vertical translation I am assuming that you are talking about portfolios if you are talking about fitting data and all that. Regression on your GDC will cover that... An exponential function can be defined as a function whose successive first differences differ by the multiplication of "a". It has no restricted domain but a range of greater or less than "d" looking if the function is vertically flipped or not I guess... Look it up if you're not sure... Yes! Danke! I was looking all over the web and I could not find this.. thank you! Reply Link to post Share on other sites More sharing options...
CkyBlue Posted October 3, 2011 Report Share Posted October 3, 2011 Oh really? It really shouldn't be that difficult, just google "properties of an exponential function" or something like that, I was a bit vague on that, my math is a bit rusty. Glad I could help you there Reply Link to post Share on other sites More sharing options...
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