Hello.

I have some functions with the same parameters and want to fit these parameters with each data.

Example:

p is parameters set. Now I consider two parameters p[1] and p[2] as examples.

```
example_1(x) = p[1] + p[2] * x
example_2(x) = p[1] * x^2 - p[2] * x
example_3(x) = p[1] + p[2] - x^2
```

And I have data sets for each function:

```
x_1, y_1, error_y_1 #data for function example_1
x_2, y_2, error_y_2 #data for function example_2
x_3, y_3, error_y_3 #data for function example_3
```

How do you fit parameters in such a situation? What package do you use?

Thank you for your kindness