correlationMatrix: Pretty correlation matrix
In sfeuerriegel/ResearchGroupTools: Collection of Custom Helper Functions

Description Usage Arguments Details Value Source Examples

Calculates a correlation matrix for a dataset and display variables, as well as P-values in asteriks notation nicely. The function also writes the table into a LaTeX file if desired.

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correlationMatrix(x, y = NULL, method = c("pearson", "spearman"),
  removeTriangle = c("upper", "lower", "none"), diagonale = FALSE,
  digits = 3, filename = NULL)

`x`	A numeric matrix for which to compute the correlation matrix.
`y`	Optional second matrix. If omitted or `NULL`, it is replaced by `x`.
`method`	Method, i.e. Pearson's `r` or Spearman's `rho` rank correlation coefficients.
`removeTriangle`	Parameter indicating whether to remove a duplicated triangle of the matrix. Defaul is the upper triangle that is removed.
`diagonale`	If `FALSE` (default), the diagonale is omitted. If `TRUE`, it is included as 1 along with significance stars.
`digits`	Number of digits to be printed (default: 3).
`filename`	Path to which a LaTeX copy is exported (default is `NULL`). If `NULL`, no file is generated.

To embed this correlation table inside LaTeX, requires a specific format as follows:

Insert the library SIunitx inside the preamble of your LaTeX document.
At the same location, define the following macro \newcommand{\sym[1]\rlap{$^{#1}$}}
Also in the preamble, change the sisetup \sisetup{input-symbols={()*}}
Finally, choose S as your column alignment.

Details: http://tex.stackexchange.com/questions/47418/siunitx-specifying-custom-command-as-input-symbol; also refer to the example in the README.

Correlation matrix with pretty output.

Idea: http://www.sthda.com/english/wiki/elegant-correlation-table-using-xtable-r-package

data(USArrests)
correlationMatrix(USArrests)

# alternatively, with table exported into a LaTeX file
correlationMatrix(USArrests, filename = "table_cor.tex")
unlink("table_cor.tex")