# Tagged Questions

A confidence interval is an interval that covers an unknown parameter with $(1-\alpha)\%$ confidence. Confidence intervals are a frequentist concept. They are often confused with credible intervals which is the Bayesian analog.

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### Making a forecast: Confidence/Prediction/Tolerance Interval?

I understand the the difference between these three types of intervals but I will summarize briefly: Confidence Interval: an interval that will contain the true mean value say, 95%, of the time. ...
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### Confidence interval for Bayesian expected probability in categorical data

The context of the question is survey results analysis. I am focusing on categorical data : N respondents answer some questions and each question has $k_{q}$ choices. I want to compare what subgroups ...
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### Logistic regression: Is there a significant difference for probability p between groups of Bernoulli random variables?

I have exactly $n$ observations of independent Bernoulli distributed random variables $Y_1, \cdots, Y_n$. I divide the observations into $k$ disjoint groups. In my case $k=3$ and $n=1450$. I proceed ...
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### Calculating standard error for a ratio of hazard ratios

I'm trying to calculate if there has been a change in risk over time, during 10 years of follow-up, for young adults to develop depression. I've successfully calculated the hazard ratio and 95% CI ...
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### Why does the Arima() method in the forecast package in R not calculate standard errors for coefficients passed to 'fixed'?

In the Arima() method, in the forecast package in R, I can provide a vector of parameters to the ...
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