QQ Plot Quantile to Quantile Plot Quantile: QQ Plot:

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Presentation transcript:

QQ Plot Quantile to Quantile Plot Quantile: QQ Plot: Points taken at regular intervals from the cumulative distribution function (CDF) of a random variable QQ Plot: Graphical method for comparing two probability distributions by plotting quantiles of their values against each other Does not include spatial-temporal information Wikipedia

Quantiles If the data set have 10 values of: 3, 6, 7, 8, 8, 10, 13, 15, 16, 20 4 quantiles would result in: 10 x ¼ = 2.5, rounded to 3 => 7 10 x ½ = 5 => 8 10 x ¾ = 7.5, rounded to 8 => 15

Normal QQ Plot

Normal QQ Plot?

Resampling Bootstrapping Jackknifing Drawing sets of samples, with replacement from the original dataset Different results each time Jackknifing Repeat the estimation leaving out part of the dataset each time Repeatable Work with any interpolation or trend-surface method