Add convenience function for conversion to ipm

Change-Id: I2b9138322558fc1a2da2f9877cefe3d2268d2412
diff --git a/man/ipm.Rd b/man/ipm.Rd
new file mode 100644
index 0000000..ed82d36
--- /dev/null
+++ b/man/ipm.Rd
@@ -0,0 +1,25 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/misc.R
+\name{ipm}
+\alias{ipm}
+\title{Convert corpus frequency table to instances per million.}
+\usage{
+ipm(df)
+}
+\arguments{
+\item{df}{table returned from \code{\link{frequencyQuery}}}
+}
+\value{
+original table with additional column \code{ipm} and converted columns \code{conf.low} and \code{conf.high}
+}
+\description{
+Convenience function for converting frequency tables to instances per
+million.
+}
+\details{
+Given a table with columns \code{f}, \code{conf.low}, and \code{conf.high}, \code{ipm} ads a \code{column ipm}
+und multiplies conf.low and \code{conf.high} with 10^6.
+}
+\examples{
+new("KorAPConnection") \%>\% frequencyQuery("Test", paste0("pubDate in ", 2000:2002)) \%>\% ipm()
+}