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Returns the sum of all measured values per DS
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f_num - Number of Values (Not NaN)
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Returns the number of valid measured values per DS
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f_grd - Gradient
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Returns the gradient of a straight line by using linear regression per DS
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f_last - Last Value
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Returns the last valid measured value per DS
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f_1st - First Value
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Returns the first valid measured value per DS
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f_nan - Number of NaNs
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Returns the number of NaNs stored per DS
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f_median - Median
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Returns that value that separates the higher half from the lower half per DS
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f_range - Range
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Returns the difference between the largest and the smallest value per DS
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f_iqr - Interquartile Range
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Returns the distance of the middle50% around the median per DS
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f_sd - Standard Deviation
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Returns the square root per data source variance
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f_var - Variance
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