Download - QQ Plot
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QQ Plot
• Quantile to Quantile Plot
• Quantile:– 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
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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
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Resampling
• Bootstrapping – 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