For nearly two decades, geologists, hydrologists, and soil scientists relied on this simple Microsoft Excel add-in to convert raw sieve and hydrometer data into the Folk and Ward (1957) graphic measures: Mean, Sorting, Skewness, and Kurtosis.
: Secure the authentic application via the Kenneth Pye Associates Ltd Software Hub . This is the most stable and reliable platform to fetch the newest iteration and access the official instruction manuals.
While "gradistat v 91 link" does not correspond to a known, publicly accessible tool, its conceptual anatomy teaches us about the pillars of reproducible research: gradient-based statistical theory, rigorous version control, and persistent identifiers for software. The inability to locate this specific link is not a failure but a reminder that in data science, a missing link is a call to action—to archive, to document, and to share code with the same care as we share our conclusions. Future statisticians would do well to ensure that every "v 91" they cite is but a click away, preserved for posterity.
A fully revised version with expanded functionality is currently under development by the original authors.
: Datasets and analysis examples using GRADISTAT v9.1 are often hosted on academic sharing platforms like Figshare . gradistat v 91 link
You should also include the version number used. For example: "Grain size statistics were calculated using GRADISTAT v9.1 software (Blott & Pye, 2001) based on the geometric graphical method (Folk and Ward, 1957)".
Gradistat v 9.1 allows you to customize how your statistics are processed. You can choose:
If you have the link but the software won't run, you are likely facing the bug. This happens because Gradistat v 9.1 references older MS Office Object Libraries.
If you are looking for specific, peer-reviewed data examples using this tool, you can explore studies on platforms like . For nearly two decades, geologists, hydrologists, and soil
: Excel has blocked the macros. Save the file to a trusted folder on your local hard drive, close Excel, right-click the file, go to Properties , and check the "Unblock" box if it appears at the bottom.
Note: As of 2026, ensure you are downloading from the authorized Kenneth Pye Associates website to avoid potential security risks. How to Use GRADISTAT for Grain Size Analysis
: Calculates mean, mode, sorting, skewness, and kurtosis using both the Folk and Ward (1957) graphical methods and moment methods .
Many university earth science departments host copies of GRADISTAT on their laboratory resource or course material pages for student use. While "gradistat v 91 link" does not correspond
Is it legal to use the gradistat v 91 link? Since v 9.1 was released as (not trialware), the original license permitted free distribution for academic and non-commercial purposes. However, because CCAP no longer supports it, using v 9.1 is generally considered "legacy use." You cannot use Gradistat v 9.1 for commercial consulting without purchasing the Pro version.
, etc.) extracted from the cumulative frequency curve. This method is particularly favored because it remains reliable even when dealing with open-ended or poorly sorted distributions. 2. Comprehensive Parameter Outputs
Study stream energy and erosion-deposition sequences in river courses. GRADISTAT software - Kenneth Pye Associates Ltd
Enter , a powerful yet easy-to-use grain size distribution and statistics package built to run entirely within Microsoft Excel. Following widespread user demand for the latest version, this article provides a definitive guide to GRADISTAT v9.1, including how to obtain the software, where to find the official academic citation, an overview of its core features, and a step-by-step tutorial to get you started.
GRADISTAT Version 9.1 is an Excel-based program developed by Kenneth Pye Associates Ltd for rapid grain size analysis, utilizing both the Method of Moments and Folk and Ward (1957) methods to process laser granulometer and sieve data. Although version 9.1 is cited in recent literature, the primary developer site frequently lists version 8.0 for download. For more details, visit Kenneth Pye Associates Ltd Kenneth Pye Associates Ltd