A function to request T-test plots on a call to
proc_ttest. The function allows you to specify the type of
regression plots to produce. It produces a combined diagnostics panel
by default. You may also specify individual plots to create by setting
the "panel" parameter to FALSE, and passing a vector of plot names
on the "type" parameter.
ttestplot(type = "default", panel = TRUE, showh0 = FALSE)The type(s) of plot to create. Multiple types should be passed as a vector of strings. Valid values are "agreement", "boxplot", "histogram", "interval", "profiles", "qqplot", "summary". The default value is a vector with "summary" and "qqplot".
Whether or not to display the summary plot combined into in a single panel. Default is TRUE. A value of FALSE will create individual plots instead. This parameter is equivalent to the "unpack" keyword in SAS.
Whether or not to show the h0 line on a single-variable T-test. Default is FALSE.
Any requested plots will be displayed on interactive reports only. Plots are created as jpeg files, and stored in a temp directory. Those temporary files are then referenced by the interactive report to display the graphic.
If desired, you may
output the report objects and pass to proc_print. To do this,
set output = report on the call to proc_freq, and pass
the entire list to proc_print.
The plots parameter allows you to request several types of T-Test
plots. Below are the types of plots that are supported. The list shows
the plot type keyword needed to request the plot, and a brief description:
agreement: An agreement plot for the input data. Only available for paired comparisons.
boxplot: Displays a box and whisker plot for group comparisons, including confidence intervals (if appropriate).
histogram: A histogram with normal curve and kernel density overlays.
interval: Visualizes the confidence intervals for means.
profiles: A line plot mapping responses between analysis variables. Available only for paired analysis.
qqplot: A quantile-quantile plot used to assess the assumption of normality.
summary: Combines the histogram and boxplot charts onto the same panel.
The above plots may be requested as a vector of keywords to the plots
parameter on proc_ttest, or as vector of values
to the type parameter on ttestplots.
Note that, when passed as a vector of keywords, only the requested plots
will be produced. That is to say, the "only" keyword in SAS is implied
at all times for proc_ttest.