dataFigure2 | R Documentation |

The data, taken from \insertCitec17superb7, is an example where the "stand-alone" 95\% confidence interval of the means returns a result in contradiction with the result of a statistical test. The paradoxical result is resolved by using adjusted confidence intervals, here the correlation- and different-adjusted confidence interval.

```
data(dataFigure2)
```

An object of class data.frame.

```
library(ggplot2)
library(gridExtra)
data(dataFigure2)
options(superb.feedback = 'none') # shut down 'warnings' and 'design' interpretation messages
## realize the plot with unadjusted (left) and ajusted (right) 95% confidence intervals
plt2a <- superbPlot(dataFigure2, WSFactors = "Moment(2)",
adjustments=list(purpose = "difference"),
variables = c("pre","post"), plotStyle="bar" ) +
xlab("Group") + ylab("Score") + labs(title="Difference-adjusted 95% CI\n") +
coord_cartesian( ylim = c(85,115) ) +
geom_hline(yintercept = 100, colour = "black", linewidth = 0.5, linetype=2)
plt2b <- superbPlot(dataFigure2, WSFactors = "Moment(2)",
adjustments=list(purpose = "difference", decorrelation = "CA"),
variables = c("pre","post"), plotStyle="bar" ) +
xlab("Group") + ylab("Score") + labs(title="Correlation and difference-adjusted\n95% CI") +
coord_cartesian( ylim = c(85,115) ) +
geom_hline(yintercept = 100, colour = "black", linewidth = 0.5, linetype=2)
plt2 <- grid.arrange(plt2a,plt2b,ncol=2)
## realise the correct t-test to see the discrepancy
t.test(dataFigure2$pre, dataFigure2$post, paired=TRUE)
```

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