The following three functions can be used with missing data. They return the mean, the standard error of the mean and the confidence interval of the mean. Note that we hesitated to provide these functions: you should deal with missing data prior to making your plot.
a vector of numbers, the sample data (mandatory);
a vector containing first a confidence level for CI (default 0.95) and
a custom degree of freedom (if unspecified, uses
the confidence interval (CI) where the
t value is based on the custom-set degree of freedom.
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