readme added

Readme.rst

+Installation
+===============
+
+Required packages in R: ``dplyr, ggplot2, reshape, knitr``. Use ``install.packages('pkngname')`` in R shell.
+
+
+Usage
+======
+
+.. code-block:: R
+
+   library(knitr)
+   knit('statistics.Rnw')
+
+
+Data is read form a csv file ``data.csv`` with columns ``Nummer, Familienname, A1,..., An`` in
+``ISO-8859-1`` encoding. Change the parameters in ``USER SETTINGS`` on line 103 in
+``statistics.Rnw`` to adapt the grading scale to your needs.
+
+
+`ess-mode <http://ess.r-project.org/>`_ in emacs supports convenient editing of R and  Rnw files (noweb files with R code blocks).

statistics.Rnw

+% Author: Simon Pintarelli <simon.pintarelli@sam.math.ethz.ch>
 % Emacs hint: use M-x ess-noweb-set-code-mode, then type R-mode
 
 \documentclass[a4paper]{article}
@@ -154,6 +155,11 @@ plot1 + theme(legend.title=element_blank())
 print(xtable(data.frame(Grade=scale$grade[I], Points=scale$s[I])), include.rownames=FALSE, floating=FALSE)
 @
 
+<<out1, echo=FALSE>>=
+ncand <- nrow(grades)
+passed <- sum(grades$grade>=4)
+@
+\vspace{0.5cm}
 {\Large \Sexpr{ passed } of \Sexpr{ncand} candidates have passed.}
 
 \pagebreak