This function inserts a LaTeX directive to draw a full or partial
line in a table.
Usage
Hline(columns, nearData = FALSE)
Value
Produces an expression to insert a label which will be interpreted by LaTeX as a request
for a horizontal line.
Arguments
columns
Which columns should receive the line?
nearData
See the Details section of Heading.
Details
Hline() is not very flexible: it must be the leftmost header in a row specification
for the table, i.e. mean * Hline() is not allowed. Anything to the right of the
Hline() factor will be ignored.