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\name{Wafer}\alias{Wafer}\title{Modeling of Analog MOS Circuits}\description{The \code{Wafer} data frame has 400 rows and 4 columns.}\format{This data frame contains the following columns:\describe{\item{Wafer}{a factor with levels\code{1}\code{2}\code{3}\code{4}\code{5}\code{6}\code{7}\code{8}\code{9}\code{10}}\item{Site}{a factor with levels\code{1}\code{2}\code{3}\code{4}\code{5}\code{6}\code{7}\code{8}}\item{voltage}{a numeric vector}\item{current}{a numeric vector}}}\details{}\source{Pinheiro, J. C. and Bates, D. M. (2000), \emph{Mixed-Effects Models in Sand S-PLUS}, Springer, New York.}\examples{str(Wafer)}\keyword{datasets}