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Undertake a paired ttest or Wilcoxon signed rank test to test for differences
between means (or medians) of paired numeric values.
Inputs are:
 Type of test desired (paired ttest or Wilcoxon signed rank);
 desired level of confidence for confidence interval estimation;
 the desired number of digits after the decimal point in summary results; and
 two columns of data (including a header row with labels for each column).
The data must be paired in rows (ie each row is a pair of corresponding measurements)
and the columns must be the same length.
Note: missing values in the data will be omitted from calculations.
For this analysis, the values in the first column are subtracted from the corresponding
values in the second column and a ttest (or signed rank test) undertaken to test for
deviation of the mean (median)
difference from zero. Outputs include:
 a summary of statistical test results for the selected test, including 2tailed
and 1tailed for both tails;
 ShapiroWilk test for normality on both sets of measurements and the differences;
 Note: for groups with < 4 or > 5000 observations it is not possible to calculate
ShapiroWilks W statistic to test for normality of distribution
 a numeric summary of the data for each measurement and the difference, including
histograms and normal plots;
 Note: for groups with only one observation or with standard deviation = 0
histograms and quantile plots are not shown.
 boxplots of the data by group and a
plot of confidence intervals about the mean (or median) value for each group.
