# Tagged Questions

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13 views

### Confidence interval of a mean [on hold]

PLEASE, can you help me with this question. The following table shows the estimates of one variable into two groups A and B. ==============Media===========StandardError===============================...
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### Confidence interval via cross-validation

I am running an experiment with 10-fold cross-validation. For each fold, I calculate my score (Kendall's tau) and its confidence interval (via bootstrap resampling). Then, I average the score values ...
6 views

### Determining confidence for individuals' performance

Apologies if this is ridiculously basic - I have searched the site but my vocabulary is probably too limited to be successful. I have a group of individuals performing a task with a boolean outcome - ...
24 views

### How can I compute the confidence level in the approximate randomization test?

(1) indicates that one can compute a confidence level from the approximate randomization test (step 4): However, (1) simply refers to (2) to view the actual calculation or table lookup. ...
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### plots of covariance with jackknifed confidence intervals in OPLS

The SIMCA-P software is able to produce plots of covariances with jackknifed confidence intervals for OPLSDA models. Is there any R package implementing the same feature? Or is there other means of ...
66 views

### Confidence & conclusion in rare event analysis

I am looking at the http://www.nejm.org/doi/full/10.1056/NEJMoa021134 paper and don't understand how they made their conclusions. According to the data in Table 1 they analyzed 440655 vaccinated ...
23 views

### Find a threshold to seperate two distributions

I have two distributions, Number of students spent specified number of hours. One distribution for students who passed the exam, another is for those who failed. Now, I want to calculate a threshold ...
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### limit of detection (interval censored) CI

I'm trying to compare data I have to other data for which I have mean and std (normally distributed). My data consists of several varibales, some of which are interval censored due to machine limit of ...
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### 1-Sided Lower Confidence Level Concept for Reliability (1-F(T))

For reliability (R) engineering discipline, reliability of an item is the conditional probability that the item will be functional within the mission duration at a given confidence level. so ...
33 views

### Minimum sample size for multiple choice question

I have a question about minimum sample sizes for a multiple choice survey. I have searched around this site and the internet, but haven't found a 100% clear answer yet. What if someone a survey was ...
22 views

### Classifiers which only answer when they are confident?

It is often true that a classifier (or regression) can give some kind of confidence in its answers, e.g. through bootstrapping. However, this is often viewed as an afterthought: "here is the answer, ...
10 views

### individual differences between two paired populations

I have two sets of data A and B each with n=80. For A and B a measurement was taken in a different condition and the data are paired. I know there is a difference between the whole populations of A ...
29 views

### Why don't I get intervals which don't contain parameter by simulation?

I effect 100 simulations, and with a confidence level 95% I expected to get by simulation 5 coinfidence intervals approximately that not contain the paramater. I always get 100 confidence intervals ...
58 views

### Confusion around Probabilistic Interpretation of Confidence Intervals

My professor told me that a confidence interval provides a measure for the resampling uncertainity. That is, if I were to re-sample this dataset a large number of times, 95% of those would contain the ...
29 views

### Confidence ellipsoids / intervals for MLE beta in logistic regression?

We assume that the prob of Y = 1 given X and beta is 1/(1+e^{-Z}) where Z = X^T\beta. Then, we want to estimate \beta, given a dataset of iid observations (X_i, Y_i). We can compute the MLE estimate, ...
42 views

### Regression: using confidence interval to remove outliers

I have to calculate a regression (for instrument calibration purposes) between Log(x) and y, where x is an environmental parameter, known to be log-distributed. Accurate measurement of x is difficult ...
23 views

### Hotelling T^2 Statistic in Simple Linear Regression

I'm at a bit of loss here, so I apologize for silly questions. I stumbled upon a problem that asked for 95% confidence bands for my estimated regression line in a simple linear regression (2 ...
35 views

### Where two confidence intervals meet?

I have two means that refers to two different samples of different populations. Let's say, for example, that the two means are 1.0 and 3.15. I can compute confidence intervals about these two cases ...
70 views

### Calculate Confidence (Error) Bands for Chi Square fit with errors using Iminuit

I want to fit some data with errors to a polynomial, say $y(x)=a+bx$. I made a $\chi^2$-fit using Iminuit but now I want to calculate the error bands ( 68,3% Confidence Bands). What is the fastest way ...
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### Should 20,000 data points provide a significant difference in confidence level over 300?

I built an automated trading system and am experiencing better results during backtesting than during real trading using the strategy I developed. During backtesting my strategy results in 300 trades ...
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### Criteria for wide Confidence interval

Is there a criteria to say a statistical confidence interval is wide or narrow? Is there any formula to know?
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### How can I get a confidence interval for p from a small cluster sample?

I have small cluster sample (n=4, N=75) where all elements in each cluster are sampled. I'm using a ratio estimate to estimate p, the proportion of successes. If I can't use the normal approximation ...
31 views

### User Study Setup: Correct selection of tasks

I'm struggling with the problem to design a formally correct user study. I have the following circumstances: I want users to assess the (subjective) usefulness of a -so called- trail result. That ...
56 views

### How to indicate a 95% confidence interval for the total amount to be paid

Can you please help me to solve this question! Peter who is soon to be married, has for a long time been thinking about the perfect morning gift for his bride, Kate. As the couple is going to run a ...
269 views

### Why is it so uncommon to report confidence intervals for medians?

Why is it so uncommon to find confidence intervals reported in papers from applied sciences? I work mostly on Computer Science, but often read papers from (Social) Psychology, Sociology and Urban ...
175 views

### Confidence measures for Gaussian mixture models

When generating Gaussian mixture models using expectation maximization with Bayesian Information Criterion, is it necessary to report a confidence measure? How do you know that the algorithms are ...
55 views

### appropriate binomial proportion confidence interval for repeated measures

So I have looked this up extensively and keep getting the same answer, but its because what I can find online isn't quite to the point. I want to put a confidence interval on a binomial proportion, ...