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Tartar for dogs

A dog experiment was carried out in order to examine the effect of two treatments on the development of tartar. Apart from the two treatment groups there was also a control group. Twenty-six dogs were used and allocated to one of the three groups. After four weeks each dog was examined, and the development of tartar was summarized by an index
A data frame with 26 observations on the following 2 variables.
  1. treat: Treatment. A factor with levels: Control, HMP, P2O7
  2. index: A numeric vector with the tartar index

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