viztest-core.md
In VizTest: Optimal Confidence Intervals for Visual Testing

viztest returns a well-formed viztest object

Correspondents of PW Tests with CI Tests
  level psame pdiff      easy  method
1  0.99     1   0.5 -2.050901  Lowest
2  0.99     1   0.5 -2.050901  Middle
3  0.99     1   0.5 -2.050901 Highest
4  0.99     1   0.5 -2.050901 Easiest

Missed Tests (n=2 of 10)
  bigger smaller pw_test ci_olap
6   zero    cyl6   Insig      No
7   zero    cyl8   Insig      No

# A tibble: 5 x 6
    vij  s_zb min_zb max_zb    zb    ci
  <int> <dbl>  <dbl>  <dbl> <dbl> <dbl>
1     1 0.506  0.945   1.92  1.44 0.850
2     2 0.381  0.945   1.83  1.45 0.853
3     3 0.325  1.07    1.79  1.49 0.863
4     4 0.412  0.907   1.83  1.51 0.870
5     5 0.474  0.907   1.92  1.61 0.893