If you are analyzing sediment, Gradistat v9.1 is not just a convenience; it is a necessity for standardization. It ensures that your statistical methodology matches the standard practices set by Folk and Ward (1957), making your data comparable to decades of geological research.
Before we hunt for the link, we must understand what "v 91" signifies. The software went through several iterations:
: Modern Windows environments automatically block internet-downloaded macros. Right-click the downloaded file, open Properties , check the Unblock box at the bottom, and click Apply.
: The safest and most reliable option is to download GRADISTAT version 8.0 directly from the developer’s website: http://www.kpal.co.uk/gradistat.html This page contains a link to download the software, along with full instructions and the original journal article citation. Since v8.0 is the latest official release, it is the most stable and well‑documented version. It is designed to work with Microsoft Excel up to version 2010, but many users have reported success with later Excel versions as well. gradistat v 91 link
is a specialized Microsoft Excel-based software program used primarily in sedimentology and geomorphology for the rapid analysis of grain size statistics. Originally developed by Simon Blott and Kenneth Pye, it streamlines the classification of sedimentary environments by calculating key distribution parameters from raw measurement data. Overview of Capabilities
GRADISTAT presents your calculations using multiple frameworks. Selecting the right data presentation depends on your specific reporting standards: Statistical Metric Method of Moments (Metric/Phi) Folk & Ward Graphical Method Utilizes the entire population data distribution. Relies on specific percentiles ( D10cap D sub 10 D50cap D sub 50 D90cap D sub 90 Outlier Sensitivity Highly sensitive to coarse or fine tail-end outliers. Robust and less skewed by extreme, anomalous single grains. Primary Use Case Advanced mathematical modeling of distribution curves.
A standout feature of GRADISTAT is its ability to calculate statistical parameters using multiple methods simultaneously, allowing for robust comparison of compositionally variable sediments. If you are analyzing sediment, Gradistat v9
Tell you where to find the official download link (as indicated in my research)
If you have raw data from sieving (weights in grams):
Once you have the file, follow these steps: The software went through several iterations: : Modern
Because it was the final public release before CCAP transitioned to a commercial product (Gradistat Pro). The "v 91" link is sought after because v9.1 requires no license key, has no expiration date, and works as a standalone Excel add-in.
: Dynamically generates cumulative frequency curves, frequency histograms, and ternary diagram plots. Comparison: Methods of Moments vs. Folk & Ward
The software is often maintained in academic repositories or specialized sedimentology pages.
Instead of inputting your data into complex external software, GRADISTAT operates as a macro-enabled Excel workbook. It organizes data for easy viewing, performs rapid calculations using multiple statistical methods, and even generates graphical outputs like frequency curves and ternary plots to help you classify sediments based on gravel, sand, and mud ratios.