| CODE | NAME | DESCRIPTION |
| ACT | Actual | An individual observation versus a summary statistic |
| AVG | Average | The arithmetic mean of n observations formed by taking the sum of all the observations and dividing by n |
| CC | Correlation Coefficient | A measure of the degree to which two variables are linearly related or the closeness of the linear relationship (Usually given the symbol r) |
| CML | Cumulative | Value derived by summing associated previous values. |
| CV | Coefficient of Variation | A measure often used to describe the variation in a population computed by dividing the sample standard deviation by the average |
| DIFF | percent difference from true | Percentage calculated by dividing the absolute difference of the actual from the true value by the true value. |
| GMEAN | Geometric Mean | Statistic computed by squaring the observations before averaging them and then taking the square root of the average |
| MEAN | Mean | The expected value of a distribution formed by summing the products of all possible values of the distribution multiplied by their probability of occurrence |
| POT | Percent of Total | Percent of analyte in total sample. e.g. moisture, lipid content |
| REC | Recovery | A relative difference statistic calculated to compare the mass of an analyte known to be present in a sample and the mass recovered in a sample extraction procedure expressed as a percent. |
| RNG | Range | Difference between the maximum and minimum observations in a set of sample results |
| RPD | Relative Percent Difference | The difference between two results divided by the value of the result for which the statistic is based (ie. mean for lab & field duplicates; or true value for calibration check solutions) expressed as a percent. |
| RTO | Ratio | Result calculated by dividing one value by another .. |
| STDEV | Standard Deviation | Also known as the sample standard deviation, this statistic describes the variability of a group of sample results by evaluating how they differ from the average |
| STE | Standard Error | Calculated error of a single result value, usually used in radionuclide analyses. |
| VAR | Variance | The square of the standard deviation |
