Gaussian psychometric curve fit

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Janani Thiyagarajan 2017-11-14

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https://ww2.mathworks.cn/matlabcentral/answers/367040-gaussian-psychometric-curve-fit

编辑： Janani Thiyagarajan 2017-11-14

采纳的回答： Star Strider

I have x = 1:5; y = [0.97 0.89 0.5 0.08 0.03]; how to find bias and slope using the function

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Star Strider 2017-11-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/367040-gaussian-psychometric-curve-fit#answer_291115

在 MATLAB Online 中打开

Use the mldivide,\ function:

x = 1:5; 
y = [0.97 0.89 0.5 0.08 0.03];
P = [ones(size(x(:)))  x(:)]\y(:);
Bias = P(1)
Slope = P(2)
Bias =
    1.3010
Slope =
   -0.2690

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Star Strider 2017-11-14

My pleasure.

Rather than adding a second post, give the details here.

Janani Thiyagarajan 2017-11-14

编辑：Janani Thiyagarajan 2017-11-14

Here is the problem I am working on; this should use erfc x = 1:5; y = [0.97 0.89 0.5 0.08 0.03]; we need to get slope and bias (The bias should be close to 3 and slope should be close to 0.78 for this) I need to use cumulative gaussian anonymous function f(x) = 1/2 ∗ erf (

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