Distributions can be positive and right-skewed, or negative and left-skewed. A high skew can reflect the presence of outliers or kurtosis. Two methods that measure skewness include Pearson’s ...

Letter Published: 28 March 1964 Negatively Skewed Distributions of Silica and Potassium in Igneous Rocks L. H. AHRENS Nature 201, 1313 (1964) Cite this article ...