Diamond Mean Comparison Charts

Defining Characteristics

  • This graph category represents mean comparison charts with CI calculated from pooled error variance.
  • The horizontal dashed line is the overall (grand) mean.
  • The line through the center of each diamond is the group mean. The top and bottom diamond vertices are the respective upper and lower 95% confidence limits (CI) about the group mean.
  • The short horizontal lines flanking the means are overlap marks:
    • In groups with equal sample sizes, overlapping marks indicate that the group means are not significantly different at the 95% confidence level).
The Elements of Diamond Mean Comparison Charts

Comparying Box & Whisker (a) and Box-Percentile (b) Plots of a Variable Whose Distribution is Shown in (c)

Defining Characteristics of Diamond Chart