ASTM E178 PDF

Nat The observation may even actually be rejected as a result of the investigation, though not necessarily so. An outlying observation, or outlier, is one that appears to deviate markedly from other members of the sample in which it occurs. Remember me for one month. If this is true, the value should be retained and processed in the same manner as the other observations in the sample.

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More E An outlying observation, or outlier, is one that appears to deviate markedly from other members of the sample in which it occurs. In this connection, the following two alternatives are of interest: i an outlying observation may be merely an extreme manifestation of the random variability inherent in the data.

If this is true, the value should be retained and processed in the same manner as the other observations in the sample. In such cases, it may be desirable to institute an investigation to ascertain the reason for the aberrant value.

The observation may even actually be rejected as a result of the investigation, though not necessarily so. At any rate, in subsequent data analysis, the outlier or outliers will be recognized as probably being from a different population than that of the other sample values.

Recommended criteria and illustrations for single samples including the Dixon criteria which are based entirely on ratios of differences between the observations, criterion using independent standard deviation, and criterion for known standard deviation are presented.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

Scope 1. Dimensional quantities in the standard are presented only as illustrations of calculation methods. The examples are not binding on products or test methods treated. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.

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ASTM E178:16

More E An outlying observation, or outlier, is one that appears to deviate markedly from other members of the sample in which it occurs. In this connection, the following two alternatives are of interest: i an outlying observation may be merely an extreme manifestation of the random variability inherent in the data. If this is true, the value should be retained and processed in the same manner as the other observations in the sample. In such cases, it may be desirable to institute an investigation to ascertain the reason for the aberrant value.

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