Heading pseudo-function normally overrides the automatic
heading on the following items in a table. Setting
override=FALSE is used in automatically
A legal R variable name, or a character constant.
Whether this heading should override one that is already present.
This replaces the automatic heading or row label on the following item
name or string as specified. If no argument
is given, the heading or label is suppressed.
An alternative form of
... is an expression to be displayed in the table.
override = FALSE, the label is only supplied if there is no other label.
This is used in the code for
This is a “pseudo-function”: it takes the form of a function call, but is
never actually called: it is
handled specially by
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