#### 8.2.57.46 tblish.dataset.npk ¶

Static Method: `out =` npk `()` ¶

  Classical N, P, K Factorial Experiment

  #### Description ¶

  A classical N, P, K (nitrogen, phosphate, potassium) factorial experiment on the growth of peas conducted on 6 blocks. Each half of a fractional factorial design confounding the NPK interaction was used on 3 of the plots.

  #### Format ¶

  `block`

    Which block (1 to 6).

  `N`

    Indicator (0/1) for the application of nitrogen.

  `P`

    Indicator (0/1) for the application of phosphate.

  `K`

    Indicator (0/1) for the application of potassium.

  `yield`

    Yield of peas, in pounds/plot. Plots were 1/70 acre.

  #### Source ¶

  Imperial College, London, M.Sc. exercise sheet.

  #### References ¶

  Venables, W. N. and Ripley, B. D. (2002). Modern Applied Statistics with S. Fourth edition. New York: Springer.

  #### Examples ¶

      t = tblish.dataset.npk;

      # TODO: Port aov() and LM to Octave