Meaning of this logistic function: -1.22/1+(-72.34e^(-3.46x))

A

arianna0202

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To preface: I'm doing an "exploration" so I have no background knowledge on this and am not allowed to ask my teacher for help....
I used logistic regression for my data sets (trying to find a lorenz curve) and got the formula -1.22/1+(-72.34e^(-3.46x)). Because -72.34 is negative, my graph looks very different from a normal logistic function and I can't find any resources to help me make sense of this equation. I need to be able to explain each part of the equation....
 
arianna0202 said:
To preface: I'm doing an "exploration" so I have no background knowledge on this and am not allowed to ask my teacher for help....
I used logistic regression for my data sets (trying to find a lorenz curve) and got the formula -1.22/1+(-72.34e^(-3.46x)). Because -72.34 is negative, my graph looks very different from a normal logistic function and I can't find any resources to help me make sense of this equation. I need to be able to explain each part of the equation....
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Did you start by graphing your data before trying to do curve fitting?

When you graph the given data, does the resulting curve look like a normal Lorenz curve?

Why use logistic regression on your data?

Is is this an exploration in welfare economics or (maybe) chaos theory?

You do realize that a Lorenz curve will necessarily pass through (0, 0) and (1, 1), do you not? You cannot construct such a curve from raw data.
 
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