Imatest ™ Stepchart analyzes the tonal response, noise, and dynamic range of reflection step charts such as the Kodak Q and Q Gray Scales (below. Q - Test. Q - test. Use to identify statistical outliers in data. This test should be applied sparingly and never more than once to a single data set. Q - Test. Q - test. Use to identify statistical outliers in data. This test should be applied sparingly and never more than once to a single data set. These advantages are discussed here. The total dynamic range is 8. The acvite areas used for the analysis is shown as think pale pink bars. Definition, Word Problems T-Distribution Non Normal Distribution Chi Square Design of Experiments Multivariate Analysis Sampling in Statistics: It offers significant advantages over standard ISO charts: Five of these charts printed letter or A4 size and mounted at the center and corners of a 3 x 3 grid makes an excellent SFR test target, suitable for testing high quality DSLRs. The bottom left plot shows the noise scaled to the difference in pixel levels between the maximum density level and the patch corresponding to a density of 1. Where gap is the absolute difference between the outlier in question and the closest number to it. Reflective charts such as the Q have a density range of only around 1. Below, I want to go through a naive example for our Dixon Q-test function using an example CSV file. It is equally well suited to larger data sets if only one outlier is present. We will build a simple set of dictionaries for different confidence intervals from the tabulated data in David B. Compare the Q statistic from Step 2 with the Q critical value in Step 3. Because the human eye responds to relative luminance differences. QA ISO- Scanner. As we would expect, basically every sample has a very relatively large standard deviation.