Tagged Questions
2
votes
1answer
74 views
Confusion with Chi-Square test
I have an extremely simple question regarding chi-square test. So far I have found two different formulas for it:
$$
\chi^2=\sum\frac{(x_o-x_e)^2}{x_e}
$$
and
$$
...
1
vote
1answer
157 views
Efficient fitting of noncentral chi-squared distribution to data?
I am looking for the most efficient way to fit a noncentral chi-squared distribution with fixed d.o.f. to a given data set. So the inputs are d.o.f. and the data and the output should be the ...
2
votes
1answer
600 views
$\chi^2$ fitting with correlated errors
I have been doing some fitting using the fairly standard expression,
$$\chi^2 = \sum_i \frac{(y_{i} - F(x_{i}, \theta))^2}{\sigma_{i}^{2}}$$
where y is my measured data, $\sigma$ is the experimental ...
1
vote
0answers
173 views
What are alternatives to uniform distribution when trying to fit observed data distribution?
I have a dataset of 500 observations and I have to find the best fitting distribution.
If I look at the histogram of the data and the QQ plot my data seems to follow an uniform distribution. But a ...
1
vote
1answer
213 views
What is the distribution of a chi-square minimizing function?
Suppose I have a set of $N$ experimental points of the form
\begin{equation}
\{x_i, y_i, d_i\},
\end{equation}
where $i=1,...,N,$ and $d_i$ are errorbars for $y_i$. To fit the data, I minimize the ...
