Originally developed by Dr. Simon J. Blott and Kenneth Pye in 2001, the software automates the laborious process of sediment classification. Harvard University Statistical Calculations
: The software produces a range of visualizations to help you interpret your data, including frequency distribution plots, cumulative curves (in phi units), and ternary diagrams such as the Gravel-Sand-Mud and Sand-Silt-Clay plots.
Plots sample compositions onto triangular matrices (such as Sand-Silt-Clay or Gravel-Sand-Mud matrices) to visually determine structural sediment classifications. Step-by-Step Data Analysis Guide
GRADISTAT will generate a "Summary Statistics" output, typically on a separate worksheet. This output includes all the calculated parameters (mean, sorting, skewness, kurtosis) in both metric and phi units, using both graphical and moment methods. You can then copy these results or save the entire workbook for your records. gradistat v 91 free
Handles both standard sieve intervals ( ) and non-standard, custom data.
However, the search for a "free" version of v91 is not without caveats. Because v91 was designed for older iterations of Microsoft Excel, users often encounter compatibility issues when running the macro on modern 64-bit systems or newer versions of Office. This leads users to seek out the specific v91 files to maintain compatibility with older datasets, or conversely, to seek the newer, updated versions that address these bugs. The demand for the specific "v91" build is often driven by the need to replicate the exact computational environment used in previous studies, adhering to the scientific principle of reproducibility.
⚠️ Note: The original free version (v9.1) is no longer officially supported by the author (S.J. Blott), but the classic freeware is still available from archive sources. For modern OS, you may need to run it in compatibility mode. Originally developed by Dr
: Produces frequency and ternary plots (e.g., Gravel-Sand-Mud) within Excel. Harvard University Where to Find It
"GRADISTAT: A grain size distribution and statistics package for the analysis of unconsolidated sediments" in the journal Earth Surface Processes and Landforms Kenneth Pye Associates Ltd Key Insights into GRADISTAT v9.1
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. This output includes all the calculated parameters (mean,
: Running entirely within Excel allows for seamless data transfer and familiar formatting.
Understanding the methods GradiStat uses is key to appreciating its power and correctly interpreting its results.