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Soil pollution in different land uses

The meuse data set has a factor variable, landuse, which specifies the type of land use or cover at the location where soil was sampled.

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  • Using a categorical-continuous interaction (e.g., the by = form), fit a model to the meuse data that predicts copper levels as a function of dist, with different smooths for each level of landuse.
  • Include a separate term for varying intercepts for each level of landuse.
  • Print the model summary.