To test your color contrast. The built-in Canvas accessibility checker will tell identify when there is a contrast issue. To find the exact ratio, you can use a tool such as the WebAIM contrast ...

Contrast ratio is an important criterion in screen quality ... and the average white output is divided by the average black output. The test may be done by calibrating the white to 100 cd/m ...

If you omit the WALD option, the test statistic computed depends on whether an ordinary generalized linear model or a GEE-type model is specified. For an ordinary generalized linear model, the ...