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{\Large  {\bf Advanced Data Analysis II}}
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36-402 \hfill Spring 1996
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{\large Hints on the final}
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Many of you presented very good preliminary analyses of the data.  I
have tried to put some specific comments on each page, but there are
also two generic comments.
\begin{itemize}
\item You can probably do better for some models by breaking the data
  into different soil types.  There is no good reason to believe that
  the same model will work for all types of soil, so you should at
  least allow for the possibility of different models, either by
  splitting the data, or building models with soil interactions.
\item Be very careful you don't use something as a predictor which
  can't be known until after the data are collected.  (To be blunt,
  don't use one of the response variables as a predictor for another
  model).
\end{itemize}
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