# Tagged Questions

22 views

### Difference estimate & confidence intervals for $\chi^2$ test between 2 proportions

I am using a chi-sq test between two proportions (http://statistic-on-air.blogspot.com/2009/07/comparison-of-two-proportions.html). I am using this over the z-test for proportions because I do not ...
160 views

### Volume of the 95% confidence ellipsoid

I'm dealing with 3D data that are the trajectory of a point over time. I would like to have an indication of how much it is "spread" in space and I thought about using the volume of the 95% confidence ...
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### Can parameter uncertainties be salvaged when the residuals are correlated? (Tweaked, reasking)

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: ...
72 views

### I study subpopulation so huge that chi-squares test insists it is not representative. How do I get confidence intervals for my population?

I want to get results about population A. But all I can study is subpopulation C of B, where B is a subpopulation of A (that is, C $\subset$ B $\subset$ A). Each member of A is classified into one of ...
43 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: ...
431 views

### P value and confidence interval for two sample test of proportions disagree

I'm using R to calculate the two-sample test for equality of proportions, where the two proportions are 350/400 and 25/25. So: ...
544 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?
325 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 ...
89 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 ...
108 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 ...
2k 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 ...
287 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 $\alpha = 0.90$, $n$ ...