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Returns the sum of all measured values per DS
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返回每个DS的所有测量值的总和
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f_num - Number of Values (Not NaN)
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f_num-数值(非NaN)
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Returns the number of valid measured values per DS
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返回每个DS的有效测量值数
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f_grd - Gradient
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f_grd-斜率
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Returns the gradient of a straight line by using linear regression per DS
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通过使用每个DS的线性回归返回直线的梯度
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f_last - Last Value
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f_last-最终值
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Returns the last valid measured value per DS
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返回每个DS的最后一个有效测量值
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f_1st - First Value
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f_1st-第一个值
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Returns the first valid measured value per DS
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返回每个DS的第一个有效测量值
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f_nan - Number of NaNs
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f_nan-NaN数
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Returns the number of NaNs stored per DS
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返回每个DS存储的NaN数
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f_median - Median
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f_median-中位数
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Returns that value that separates the higher half from the lower half per DS
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返回将每个DS的上半部分与下半部分分隔开的值
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f_range - Range
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f_range-范围
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Returns the difference between the largest and the smallest value per DS
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返回每个DS的最大值和最小值之间的差值
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f_iqr - Interquartile Range
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f_iqr-四分位间距
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Returns the distance of the middle50% around the median per DS
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返回中间50%的距离;每个DS的中值附近
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f_sd - Standard Deviation
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f_sd-标准偏差
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Returns the square root per data source variance
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返回每个数据源方差的平方根
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f_var - Variance
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f_var-方差
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