Gaussian psychometric curve fit

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

Answer 1

[Star Strider]

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

[Janani Thiyagarajan]

thanks a lot I am reposting the questions to give more details

[Star Strider]

My pleasure.

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

[Janani Thiyagarajan]

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 (