STDEV

Famoxadone, IN-JS940, and IN-KZ007 residues are measured in soil (p-g kg ), sediment (p-gkg ), and water (pgL ). Quantification is based on analyte response in calibration standards and sample extract analyses determined as pg mL Calibration standard runs are analyzed before and after every 1 samples in each analytical set. Analyte quantification is based on (1) linear regression analysis of (y-axis) analyte concentration (lagmL Q and (x-axis) analyte peak area response or (2) the average response factor determined from the appropriate calibration standards. The SLOPE and INTERCEPT functions of Microsoft Excel are used to determine slope and intercept. The AVERAGE and STDEV functions of Microsoft Excel are used to determine average response factors and standard deviations. 

DOUBLE PRECISION stdev(nparmx),bv(nparmx),bvs(nparmx)... 

DOUBLE PRECISION stdev(nparz),bv(nparz),bvs(nparz),pivpag(50)... 

Entry Position % Mean conversion Stdev % Mean conversion Stdev... 

The sample mean and sample standard deviation are obtained by using Microsoft Excel with the commands AVERAGE(B2 B7) and STDEV(B2 B7) when the observations are in cells B2 to B7. 

Note for this example that covar(X, Y) represents the covariance of (X, Y), stdev(X) is the standard deviation of the X data, and stdev(T) is the standard deviation of the Y data. For the MathCad program ( 1986-2001 MathSoft Engineering Education, Inc., 101 Main Street Cambridge, MA 02142-1521), the sldcvfW) is represented by the variable symbol Sr, which can be thought of as the set of many possible standard deviations for a set of data X. 

Comparison of Correlation Coefficient (r) and SEE Enter Data Sr = stdev(X)... 

In Microsoft Excel, these are calculated by the functions =AVERAGE (range and =STDEV (range, respectively, where range is the range of cells containing the n data (e.g., Al A5). It is said that x is an estimate of p, and s is an estimate of a. 

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