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\hypersetup{
  pdftitle={HW6 Markdown},
  pdfauthor={Chay Bagan},
  hidelinks,
  pdfcreator={LaTeX via pandoc}}

\title{HW6 Markdown}
\author{Chay Bagan}
\date{2022-09-29}

\begin{document}
\maketitle

\begin{Shaded}
\begin{Highlighting}[]
\CommentTok{\#Chay Bagan Homework 6}

\FunctionTok{library}\NormalTok{(caret)}
\end{Highlighting}
\end{Shaded}

\begin{verbatim}
## Loading required package: ggplot2
\end{verbatim}

\begin{verbatim}
## Loading required package: lattice
\end{verbatim}

\begin{Shaded}
\begin{Highlighting}[]
\FunctionTok{library}\NormalTok{(FNN)}
\NormalTok{housing.df }\OtherTok{\textless{}{-}} \FunctionTok{read.csv}\NormalTok{(}\StringTok{"BostonHousing.csv"}\NormalTok{)}

\FunctionTok{set.seed}\NormalTok{(}\DecValTok{123}\NormalTok{)}
\NormalTok{train.index }\OtherTok{\textless{}{-}} \FunctionTok{sample}\NormalTok{(}\FunctionTok{row.names}\NormalTok{(housing.df), }\FloatTok{0.6}\SpecialCharTok{*}\FunctionTok{dim}\NormalTok{(housing.df)[}\DecValTok{1}\NormalTok{])  }
\NormalTok{valid.index }\OtherTok{\textless{}{-}} \FunctionTok{setdiff}\NormalTok{(}\FunctionTok{row.names}\NormalTok{(housing.df), train.index)  }
\NormalTok{train.df }\OtherTok{\textless{}{-}}\NormalTok{ housing.df[train.index, }\SpecialCharTok{{-}}\DecValTok{14}\NormalTok{]}
\NormalTok{valid.df }\OtherTok{\textless{}{-}}\NormalTok{ housing.df[valid.index, }\SpecialCharTok{{-}}\DecValTok{14}\NormalTok{]}

\NormalTok{train.norm.df }\OtherTok{\textless{}{-}}\NormalTok{ train.df}
\NormalTok{valid.norm.df }\OtherTok{\textless{}{-}}\NormalTok{ valid.df}
\NormalTok{housing.norm.df }\OtherTok{\textless{}{-}}\NormalTok{housing.df}

\NormalTok{norm.values }\OtherTok{\textless{}{-}} \FunctionTok{preProcess}\NormalTok{(train.df, }\AttributeTok{method=}\FunctionTok{c}\NormalTok{(}\StringTok{"center"}\NormalTok{, }\StringTok{"scale"}\NormalTok{))}
\NormalTok{train.norm.df }\OtherTok{\textless{}{-}} \FunctionTok{as.data.frame}\NormalTok{(}\FunctionTok{predict}\NormalTok{(norm.values, train.df))}
\NormalTok{valid.norm.df }\OtherTok{\textless{}{-}} \FunctionTok{as.data.frame}\NormalTok{(}\FunctionTok{predict}\NormalTok{(norm.values, valid.df))}
\NormalTok{housing.norm.df }\OtherTok{\textless{}{-}} \FunctionTok{as.data.frame}\NormalTok{(}\FunctionTok{predict}\NormalTok{(norm.values, housing.df))}

\NormalTok{accuracy.df }\OtherTok{\textless{}{-}} \FunctionTok{data.frame}\NormalTok{(}\AttributeTok{k =} \FunctionTok{seq}\NormalTok{(}\DecValTok{1}\NormalTok{, }\DecValTok{5}\NormalTok{, }\DecValTok{1}\NormalTok{), }\AttributeTok{RMSE =} \FunctionTok{rep}\NormalTok{(}\DecValTok{0}\NormalTok{, }\DecValTok{5}\NormalTok{))}

\ControlFlowTok{for}\NormalTok{(i }\ControlFlowTok{in} \DecValTok{1}\SpecialCharTok{:}\DecValTok{5}\NormalTok{)\{}
\NormalTok{  knn.pred}\OtherTok{\textless{}{-}}\NormalTok{class}\SpecialCharTok{::}\FunctionTok{knn}\NormalTok{(}\AttributeTok{train =}\NormalTok{ train.norm.df[,}\SpecialCharTok{{-}}\DecValTok{13}\NormalTok{],                          }
                       \AttributeTok{test =}\NormalTok{ valid.norm.df[,}\SpecialCharTok{{-}}\DecValTok{13}\NormalTok{],                          }
                       \AttributeTok{cl =}\NormalTok{ train.df[,}\DecValTok{13}\NormalTok{], }\AttributeTok{k =}\NormalTok{ i)}
\NormalTok{  accuracy.df[i,}\DecValTok{2}\NormalTok{]}\OtherTok{\textless{}{-}}\FunctionTok{RMSE}\NormalTok{(}\FunctionTok{as.numeric}\NormalTok{(}\FunctionTok{as.character}\NormalTok{(knn.pred)),valid.df[,}\DecValTok{13}\NormalTok{])}
\NormalTok{\}}

\NormalTok{accuracy.df}
\end{Highlighting}
\end{Shaded}

\begin{verbatim}
##   k     RMSE
## 1 1 4.941440
## 2 2 5.143047
## 3 3 6.191194
## 4 4 6.772547
## 5 5 6.961959
\end{verbatim}

\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{new.df}\OtherTok{\textless{}{-}}\FunctionTok{data.frame}\NormalTok{(}\FloatTok{0.2}\NormalTok{,}\DecValTok{0}\NormalTok{,}\DecValTok{7}\NormalTok{,}\DecValTok{0}\NormalTok{,}\FloatTok{0.538}\NormalTok{,}\DecValTok{6}\NormalTok{,}\DecValTok{62}\NormalTok{,}\FloatTok{4.7}\NormalTok{,}\DecValTok{4}\NormalTok{,}\DecValTok{307}\NormalTok{,}\DecValTok{21}\NormalTok{,}\DecValTok{10}\NormalTok{)}
\FunctionTok{names}\NormalTok{(new.df)}\OtherTok{\textless{}{-}}\FunctionTok{names}\NormalTok{(train.norm.df)[}\SpecialCharTok{{-}}\DecValTok{13}\NormalTok{]}

\NormalTok{new.norm.values }\OtherTok{\textless{}{-}} \FunctionTok{preProcess}\NormalTok{(new.df, }\AttributeTok{method=}\FunctionTok{c}\NormalTok{(}\StringTok{"center"}\NormalTok{, }\StringTok{"scale"}\NormalTok{))}
\end{Highlighting}
\end{Shaded}

\begin{verbatim}
## Warning in preProcess.default(new.df, method = c("center", "scale")): Std.
## deviations could not be computed for: CRIM, ZN, INDUS, CHAS, NOX, RM, AGE, DIS,
## RAD, TAX, PTRATIO, LSTAT
\end{verbatim}

\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{new.norm.df }\OtherTok{\textless{}{-}} \FunctionTok{predict}\NormalTok{(new.norm.values, }\AttributeTok{newdata =}\NormalTok{ new.df)}

\NormalTok{new.knn.pred }\OtherTok{\textless{}{-}}\NormalTok{ class}\SpecialCharTok{::}\FunctionTok{knn}\NormalTok{(}\AttributeTok{train =}\NormalTok{ train.norm.df[,}\SpecialCharTok{{-}}\DecValTok{13}\NormalTok{],}
                           \AttributeTok{test =}\NormalTok{ new.norm.df,}
                           \AttributeTok{cl =}\NormalTok{ train.df}\SpecialCharTok{$}\NormalTok{MEDV, }\AttributeTok{k =} \DecValTok{2}\NormalTok{)}
\NormalTok{new.knn.pred}
\end{Highlighting}
\end{Shaded}

\begin{verbatim}
## [1] 21
## 180 Levels: 5 5.6 6.3 7 7.2 7.5 8.1 8.3 8.4 8.5 8.8 9.5 9.7 10.2 10.5 ... 50
\end{verbatim}

\begin{Shaded}
\begin{Highlighting}[]
\CommentTok{\#C. The error of the training set can be seen below}
\NormalTok{new.accuracy.df}\OtherTok{\textless{}{-}}\FunctionTok{RMSE}\NormalTok{(}\FunctionTok{as.numeric}\NormalTok{(}\FunctionTok{as.character}\NormalTok{(new.knn.pred)),valid.df[,}\DecValTok{13}\NormalTok{])}
\NormalTok{new.accuracy.df}
\end{Highlighting}
\end{Shaded}

\begin{verbatim}
## [1] 9.469794
\end{verbatim}

\end{document}
