Tagged Questions
2
votes
0answers
20 views
Can parameter uncertainties be salvaged when the residuals are correlated?
I have a nonlinear physical model for which I'm trying to determine parameter uncertainties using Monte Carlo. Instead of describing the nitty-gritty details, I will use a series of figures:
...
1
vote
1answer
89 views
Why is the CI for an odds ratio not always centered on the sample value?
Also, what will tend to produce a CI in which the sample value is far above the center, or far below the center?
2
votes
1answer
208 views
Test for multinomial distribution
I have a sample of animals and a categorical variable of $L$ behaviors $i=1,...L$. I computed the proportions of this sample corresponding to each behavior category $p_{i}$, $\sum p_{i}=1$.
Can I ...
0
votes
0answers
59 views
How well the experiment would do in excluding alternative hypothesis?
The experiment has $N$ observations $N_i$ which are Poisson Distributed random variables (i.e. we have histogram with $N$ bins. The width of bins is not fixed so I can adjust it ) . I have two ...
1
vote
0answers
94 views
Proper interpretation for error analysis
Given an arbitrary discrete distribution and an observed distribution coming from a Monte Carlo simulation, my goal is to be able to say whether or not the observed distribution is the same is the ...
5
votes
2answers
1k views
Confidence interval for chi-square
I am trying to find a solution to compare two "goodness-of-fit chi-square" tests.
More precisely, I want to compare results from two independent experiments. In these experiments the authors used the ...
0
votes
1answer
249 views
Solving a system of equation involving the chi-square distribution
Consider the system of equations:
$$\begin{align}
2000 &= \frac{2T}{\chi^2_{2n+2}(1-\alpha)} \\
2370&= \frac{2T}{\chi^2_{2n}(\alpha)} \\
\end{align}$$
where $\alpha = 0.90$, $n$ ...
1
vote
3answers
390 views
Statistical significance when A/B test has multiple values
I'm sure this is a pretty standard statistics question, but I'm no expert... I'm running an A/B test on my website to see if a change results in users adding more content. So there are 2 basic ...
1
vote
0answers
138 views
Minimal number of samples/conversions for statistical validity
We are measuring conversion rates (% of visitors who bought) on an e-commerce site.
The test apply to a segment of visitors who meet specific criteria (for example people from a certain country).
...
