## Solved – Does it make sense to add error bars in a bar chart of frequencies

Assume a survey plot that shows a histogram of percentages of respondent's answers, like the following which shows "Percentages of respondents' answers for five tornado warning behaviors across six lead time and daylight scenarios": Do error bars make any sense for a plot like that? As far as I know, error bars are useful only … Read more

## Solved – How to calculate the confidence interval of an ICC

Here's the output from my the summary of lmer function which I used to calculate the ICC. Linear mixed model fit by REML ['lmerMod'] Formula: CareChange ~ 1 + (1 | PROVIDER) Data: MEA_data_1 REML criterion at convergence: 35.2 Scaled residuals: Min 1Q Median 3Q Max -0.3093 -0.2829 -0.2711 -0.2599 3.6206 Random effects: Groups Name … Read more

## Solved – How to find a confidence interval for the total number of events

I have detector which will detect an event with some probability p. If the detector says that an event occured, then that is always the case, so there are not false-positives. After I run it for some time, I get k events detected. I would like to calculate what the total number of events that … Read more

## Solved – How to find a confidence interval for the total number of events

I have detector which will detect an event with some probability p. If the detector says that an event occured, then that is always the case, so there are not false-positives. After I run it for some time, I get k events detected. I would like to calculate what the total number of events that … Read more

## Solved – Interpreting a 95% confidence interval

I originally posted the following as a partial answer to a question asking why a 95% confidence interval does not imply that there is a 95% chance that the interval contains the true mean (see: Why does a 95% Confidence Interval (CI) not imply a 95% chance of containing the mean?). A commenter (thanks to … Read more

## Solved – Interpreting a 95% confidence interval

I originally posted the following as a partial answer to a question asking why a 95% confidence interval does not imply that there is a 95% chance that the interval contains the true mean (see: Why does a 95% Confidence Interval (CI) not imply a 95% chance of containing the mean?). A commenter (thanks to … Read more

## Solved – Why is the Tukey confidence interval wider than the T-test confidence interval

I have two confidence intervals for a comparison of two means. The first is a t-test CI and the other is a Tukey CI. The Tukey CI \$(2.36, 26.5)\$ is wider than the t-test CI \$(6.46, 21.33)\$. What is the reason for this? Best Answer In the context of testing differences in group means on … Read more

## Solved – 95% confidence interval for mean of a large sample

I have a large sample of experimental observations for different categories (specifically, the runtime of an algorithm in different scenarios). I want to plot the mean runtime for each category/scenario and also show the 95% confidence interval using R. According to the central limit theorem, the mean of each category should be normally distributed (because … Read more

## Solved – 95% confidence interval for mean of a large sample

I have a large sample of experimental observations for different categories (specifically, the runtime of an algorithm in different scenarios). I want to plot the mean runtime for each category/scenario and also show the 95% confidence interval using R. According to the central limit theorem, the mean of each category should be normally distributed (because … Read more

## Solved – How to get a confidence interval around the output of logistic regression

I'm doing logistic regression with two classes (A and B), and I'd like to be able to describe the outputs of the model in terms of (calibrated) probabilities that each sample is in class A or B. If there are a lot of (both train and test) samples, logistic regression seems to be well behaved … Read more