Edit Interval Bar -
Optionsoverview how to examples see also
Edit Interval Bar -
OptionsSelect interval bars > Editor > Edit Interval Bar > Options
Use to customize interval bar type, display one- or two-sided intervals, and use a pooled standard deviation to calculate the intervals.
Type of Interval
Standard error: Choose to display standard error bars, where the error bars extend one or more standard errors away from the mean.
Multiple: Enter a positive number to be used as the multiplier for standard errors (1 is the default).
Confidence interval: Choose to display confidence intervals. The confidence intervals assume a normal distribution for the data and use t-distribution critical values.
Level: Enter a number between 0 and 100 to specify the confidence level. The default is 95%. The interval bar endpoints correspond to the values of a confidence interval for the mean.
Bonferroni: Check to calculate Bonferroni intervals.
Side: Choose the location of the bars. When you choose two-sided, bars are drawn above and below the mean. Upper one-sided gives bars above; lower one-sided draws bars below the mean.
For confidence intervals (default), the one-sided bars are shorter than the same side of the two-sided bars because Minitab uses a one-sided test. For standard error bars, the distance that error bars extend above or below the mean remains the same regardless of the selected side.
Pool error across groups: Check to use the pooled degrees of freedom to calculate the critical value from the t-distribution for confidence interval bars, or a pooled standard error instead of calculating the error for each subgroup for standard error bars.