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 Unable to understand what the x1 means in the help
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unudurupati

USA
1 Posts

Posted - 12/08/2019 :  8:54:17 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2019 (64-bit)
9.6.0.172 (Academic)

Operating System:Windows 8, 64 bit

The link to the help page is : https://www.originlab.com/doc/Origin-Help/Logistic-FitFunc



I understand that the n value is for the Hill Coefficient and x0 is the IC50 or EC50, basically the point where the response is 50% of the maximum. What I don't understand is, what is this x1 where the tangent has been drawn? While I can see the expression for it, I don't get by what it means?

UmaN

Shirley_GZ

China
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Posted - 12/09/2019 :  03:52:16 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi UmaN,

"x1" is the X value of the point, the second derivative of Y of which is zero(y''=0). At this point, the slope of the tangent line has the biggest value.

Thanks,
Shirley
OriginLab

Originlab Technical Service Team
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