Training and consultancy for testing laboratories.

Posts tagged ‘outliers’

Outlier test statistics


It is quite difficult to identify suspected values visually as outliers from a set of data collected. Very often, an outlier statistic test is to be performed before further action such as deletion of such data or further testing, as we do not wish to discard such data without sound statistical justification. Read on … The outlier test statistic

What is an outlier?

outlying point

In repeated chemical analysis which assumes normal probability distribution, we may find some extreme (i.e. the biggest or smallest result) is a suspect which seems to be quite different from the rest of the data set.  In other words, this result does not seem to belong to the distribution of the rest of the data.  This suspect value is called an outlier.  Read more …. What is an outlier ?


How to evaluate outliers in regression?


Handling systematic errors in testing


Statistical tests for checking normality


Mandel’s k and h consistency test statistics – What and how?


Outliers in analytical data – Purpose and action on detection

Outliers in analytical data – Purpose and action

Cochran’s C test for outliers

Cochran C test for outliers

Identifying Outliers

Determination of Suspected Results and Outliers