## 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 compute (or numerically estimate) the standard error of the MLE

I have a model for which I know the log likelihood function, the gradient of the log likelihood and the Hessian of the log likelihood. For given data I can compute the MLE using a generic optimizer (Nelder-Mead). How do I compute (or estimate) the standard error for the MLE? If there is existing software … Read more

## Solved – Error bars in interaction plot for ANOVA

I notice whenever I see an interaction plot for say a simple two factor ANOVA there are no error bars present, just the points for the estimated means. Is it ever appropriate to display error bars in an interaction plot for an ANOVA? If yes when would you want to do this and how would … Read more

## Solved – the error bars cross zero, is this ok

I have plotted the total consumption (g) of a solution by my experimental organisms. However, when I plotted the error bars (s.e.m) a few crossed zero (see image). (1) is this correct/plausible? (2) How should I interpret this? thanks in advance. [![Standard-error bar plot]] Best Answer I assume the quantity you are looking at should … Read more

## Solved – Correcting standard errors when the independent variables are autocorrelated

I have a question about how to correct standard errors when the independent variable has correlation. In a simple time series setting we can use Newey-West covariance matrix with a bunch of lags and that will take care of the problem of correlation in the residuals. What does one do in a panel data setting? … Read more

## Solved – standard symbol for standard error

The mean of a dataset is often represented by the Greek letter \$mu\$, and the standard deviation of a dataset is often represented by the Greek letter \$sigma\$. But what about the standard error? I've seen authors use SE, se, \$sigma_bar{x}\$, and \$s_bar{x}\$. The Wikipedia article on standard error uses both SE and \$sigma_bar{x}\$. Is … Read more

## Solved – standard symbol for standard error

The mean of a dataset is often represented by the Greek letter \$mu\$, and the standard deviation of a dataset is often represented by the Greek letter \$sigma\$. But what about the standard error? I've seen authors use SE, se, \$sigma_bar{x}\$, and \$s_bar{x}\$. The Wikipedia article on standard error uses both SE and \$sigma_bar{x}\$. Is … Read more

## Solved – Do Beta weights from regression have error terms

I am looking at standardized regression weights (i.e., Beta weights). I was thinking of reporting the errors next to the weights in a figure, but upon some thought I was debating whether such errors even exist. I know un-standardized regression weights have standard error parameters, but do standardized regression weights have error terms? Best Answer … Read more

## Solved – Do Beta weights from regression have error terms

I am looking at standardized regression weights (i.e., Beta weights). I was thinking of reporting the errors next to the weights in a figure, but upon some thought I was debating whether such errors even exist. I know un-standardized regression weights have standard error parameters, but do standardized regression weights have error terms? Best Answer … Read more

## Solved – When is the standard error of the mean impossibly large for a given data range, when we know the sample size

While reading an article (published and peer-reviewed, referenced below) investigating proportions of different tissue types in the human brain I came upon a table presenting data on the different subgroups in the study. Data was presented as means +/- SE (which I assume to be standard error, although I could not see it specified in … Read more