Essential Graphing • Summary Charts • Launch the Chart Platform • Adding Error Bars
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Adding Error Bars
Error bars are available when the Mean statistic is selected for at least one Y variable, and at least one X variable is assigned. Error Bars are not available for pie charts. Selecting Add Error Bars to Mean causes additional options to appear in the Chart launch window.
After the option is checked, select a type of error bar from the menu that appears. Some of the types of error bar have an additional numeric field. The following types of error bars are available:
Range
Creates error bars based on the range of the data.
Standard Error
Creates error bars based on the standard error of the mean. You can specify the number of standard errors.
Standard Deviation
Creates error bars based on the standard deviation of the data. You can specify the number of standard deviations.
Confidence Interval
Creates error bars based on a confidence interval of the mean. The standard deviation used for the confidence interval is separate for each bar. You can specify the level of confidence.
Confidence Interval (pooled)
Creates error bars based on a confidence interval of the mean. The standard deviation used for the confidence interval is based on the pooled standard deviation. This option is not available if you have more than one category variable. You can specify the level of confidence.

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Help created on 7/12/2018