In the world of sedimentology and particle size analysis, few pieces of software have achieved the cult status of . Developed by Simon J. Blott and Kenneth Pye of the UK-based company CCAP (Committee for the Coordination of Analytical Procedures), Gradistat provided a free, accessible, and scientifically rigorous method for calculating grain size statistics.
: Blott and Pye (2001) provides the theoretical background and a breakdown of the statistics used in the program. gradistat v 91 link
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Because "Gradistat" is not a cloud-based software but rather a protected Excel workbook (typically .xlsm or .xls ), there is no public "browser link" to access it directly. It must be downloaded and opened in Microsoft Excel. : Blott and Pye (2001) provides the theoretical
: It computes mean, mode, sorting, and skewness using both the Folk and Ward (1957) and Method of Moments methods .