#### 8.2.57.3 tblish.dataset.airquality ¶

Static Method: `out =` airquality `()` ¶

  New York Air Quality Measurements from 1973

  #### Description ¶

  Daily air quality measurements in New York, May to September 1973.

  #### Format ¶

  `Ozone`

    Ozone concentration (ppb)

  `SolarR`

    Solar R (lang)

  `Wind`

    Wind (mph)

  `Temp`

    Temperature (degrees F)

  `Month`

    Month (1-12)

  `Day`

    Day of month (1-31)

  #### Source ¶

  New York State Department of Conservation (ozone data) and the National Weather Service (meteorological data).

  #### References ¶

  Chambers, J. M., Cleveland, W. S., Kleiner, B. and Tukey, P. A. (1983). Graphical Methods for Data Analysis. Belmont, CA: Wadsworth.

  #### Examples ¶

      t = tblish.dataset.airquality
      # Plot a scatter-plot plus a fitted line, for each combination of measurements
      vars = {"Ozone", "SolarR", "Wind", "Temp" "Month", "Day"};
      n_vars = numel (vars);
      figure;
      for i = 1:n_vars
        for j = 1:n_vars
          if (i == j)
            continue
          endif
          ix_subplot = (n_vars * (j - 1) + i);
          hax = subplot (n_vars, n_vars, ix_subplot);
          var_x = vars{i};
          var_y = vars{j};
          x = t.(var_x);
          y = t.(var_y);
          scatter (hax, x, y, 10);
          # Fit a cubic line to these points
          # TODO: Find out exactly what kind of fitted line R's example is using, and
          # port that.
          hold on
          p = polyfit (x, y, 3);
          x_hat = unique(x);
          p_y = polyval (p, x_hat);
          plot (hax, x_hat, p_y, "r");
        endfor
      endfor