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copied!<p>To change the labels for <code>Cohort</code>, change the column and rownames:</p> <pre><code>rownames(Cohort) <- 1:4 colnames(Cohort) <- 5:8 </code></pre> <p>You also add table titles to the <code>xtable</code> call:</p> <pre><code>print(xtable(Cohort, caption = 'My Title'), caption.placement = 'top') </code></pre> <p>You can use <code>caption.placement</code> to tell where to put the caption.</p> <p><strong>EDIT:</strong></p> <p>Based on the comments, I didn't answer the question above. To make <code>xtable</code> print more like <code>table</code> with the labels above the levels, you use <code>add.to.row</code> in the <code>print.xtable</code> function:</p> <pre><code>addtorow <- list() addtorow$pos <- list() addtorow$pos[[1]] <- 0 addtorow$pos[[2]] <- 0 addtorow$command <- c('& & Grade 6 & & \\\\\n', "Grade 3 & A & B & C & D \\\\\n") print(xtable(Cohort, caption = 'My Title'), caption.placement = 'top', add.to.row = addtorow, include.colnames = FALSE) </code></pre> <p><code>add.to.row</code> takes a list with two elements: <code>pos</code> and <code>command</code>. <code>pos</code> is a list of whose length is the same as <code>command</code> which is a vector. Each element of <code>pos</code> is the line in the table where you are placing the corresponding element of <code>command</code>. </p> <p>Here, I want the first two lines to be where the labels go. I set the first and second elements of <code>pos</code> to 0 to indicate that I am putting things on the top of the table. The 0 position is that between the two horizontal rules in the table.</p> <p>The <code>\\\\\n</code> produce the '\\' in the LaTeX code that is used at the end of each line of a table plus a newline character. </p> <p>The help for <code>xtable</code> has a good example of <code>add.to.row</code> for more information. </p>

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