Gradistat V 91 Free New! -
Disclaimer: GradiStat v9.1 is an older, freeware software package (often distributed via academic archives). This review reflects its functionality as a classic tool, not a modern cloud-based application.
Step 5: Interpret the Output
You will see:
- Mean grain size (e.g., 2.1 φ → fine sand)
- Sorting (Very well sorted to Extremely poorly sorted)
- Skewness (Very fine skewed to Very coarse skewed)
- Kurtosis classification
Practical Notes & Nuance
- Method choice matters: Folk & Ward (graphical) and moment methods can yield different values—report the method used and consider providing multiple metrics for transparency.
- Unit conversions: phi scale is logarithmic; confirm whether input is phi or mm and convert consistently before analysis to avoid systematic errors.
- Sample size effects: small counts reduce reliability of higher moments (skewness, kurtosis). Use bootstrap or resampling for uncertainty estimates when sample sizes are small.
- Bimodal/multimodal samples: automatic modal detection can misrepresent mixed populations—inspect histograms and probability plots and consider deconvolution methods if required.
- Grain-size classes: when using class-interval data, the choice of binning affects histograms and some derived stats; use consistent bin schemes for comparative studies.
- Reproducibility: save raw inputs, parameter settings, and software version (v91) in metadata when publishing or sharing results.
Prerequisites
- Microsoft Excel 2010, 2013, 2016, 2019, or Office 365 (Windows)
- Macros enabled (you must adjust security settings: File → Options → Trust Center → Trust Center Settings → Enable all macros)
The Verdict in 30 Seconds
GradiStat v9.1 Free is a no-frills, deterministic tool designed for one thing: univariate gradient analysis (specifically, calculating the statistical optimum and tolerance of species along an environmental gradient). If you are a paleontologist or ecologist needing to replicate a 1990s transfer function, this is gold. If you expect graphs, intuitive data handling, or any support for multivariate analysis, look elsewhere.
Option 3: Visual / Instagram Post
Best if you have a screenshot of the spreadsheet or a grain size graph.
Caption: Speed up your lab work with Gradistat v9.1! 📊🪨
The essential tool for sedimentologists just got an update. If you haven't tried Gradistat yet, it is the standard for calculating grain size distribution, sorting, and skewness without the headache.
✅ Free download ✅ Excel compatible ✅ Instant graphs
Grab the v9.1 update at the link in our bio/below! 👇
#GeologyLife #Sedimentology #Gradistat #LabHacks #PhDChat #Research #EarthScience
Note: If you have the specific download link (usually hosted on a university faculty page or a geology repository), make sure to paste it where it says [Insert Link Here].
GRADISTAT is a specialized Microsoft Excel-based software used for the statistical analysis of grain size data in geomorphology and sedimentology. While the most widely documented versions are v4.0 and v8.0, the software's core features remain focused on processing data from sieve or laser granulometer techniques. Key Features and Capabilities
Statistical Calculations: It provides rapid calculation of grain size statistics using both the Folk and Ward (1957) and Method of Moments methods.
Metric and Phi Units: Statistics (mean, mode, sorting, skewness, kurtosis) are calculated arithmetically/geometrically in metric units and logarithmically in phi units. gradistat v 91 free
Graphical Output: Generates various visual data representations, including frequency curves, cumulative plots, and ternary diagrams (e.g., Sand-Silt-Clay plots).
Excel Integration: Runs as a macro-enabled workbook (.xls or .xlsm), allowing users to input data directly into a spreadsheet environment for processing up to 50 samples per hour.
Flexible Data Input: Accepts weight retained on sieves or percentage sediment detected in size classes from laser granulometers, sedigraphs, or Coulter counters. Version Information v4.0: The original version published in 2001.
v8.0: Released in 2010 to support newer versions of Microsoft Excel (up to Excel 2010).
GRADISTAT-PRO: A more advanced version with greater functionality was reported to be under development by the original authors.
If you are looking for a specific download for "v9.1," please note that official sources often refer to v8.0 as the primary stable release, though various researchers may use modified or local iterations. GRADISTAT software - Kenneth Pye Associates Ltd
Purpose: It calculates particle size statistics (mean, mode, sorting, skewness) for sieve or laser granulometer data using Folk and Ward (1957) and method of moments techniques.
Platform: The software is designed as a macro-enabled Microsoft Excel spreadsheet.
Availability: The original version and Version 8.0 (released for Excel 2007–2010) are available through research-related platforms or directly from the developers.
Current Status: A fully revised version called GRADISTAT-PRO is currently under development to offer enhanced functionality. Where to Access
You can find documentation and download links for authorized versions at:
Kenneth Pye Associates Ltd (KPAL): The primary host for the software and its updates. Disclaimer: GradiStat v9
ResearchGate: Often contains community-shared instructions and earlier macro versions.
Scribd: Provides user manuals and PDF guides for operating the software. GRADISTAT software - Kenneth Pye Associates Ltd
GRADISTAT is a widely used software package designed for the rapid analysis of grain size statistics from unconsolidated sediments. Originally developed by Simon J. Blott and Kenneth Pye, it operates as an integrated macro within Microsoft Excel, making it highly accessible for researchers in geomorphology and sedimentology.
While users often search for "GRADISTAT v 9.1," it is important to note that official versions listed by the developers typically include Version 4.0, 8.0, and a newer "GRADISTAT-PRO" currently under development. References to "v 9.1" may stem from the software's historical compatibility with older Excel versions (like Excel 2000, also known as version 9.0) or confusion with other statistical packages like STATISTICA 9.1. Key Features of GRADISTAT
GRADISTAT automates the calculation of essential sedimentological statistics, allowing researchers to process approximately 50 samples per hour.
Statistical Methods: It calculates mean, mode, sorting (standard deviation), skewness, and kurtosis using both the Method of Moments and the Folk and Ward (1957) graphical methods.
Versatile Input: The program accepts data from various measuring techniques, including traditional sieving, laser granulometry, X-ray sedigraphs, or Coulter counters.
Multi-Scale Output: Statistics are provided in both metric units (micrometers) and logarithmic phi units.
Graphical Tools: GRADISTAT generates a range of visual outputs, including frequency histograms, cumulative distribution curves, and ternary (triangular) plots. How to Download GRADISTAT for Free
GRADISTAT is generally available as a free download for academic and research purposes through official and institutional channels:
Kenneth Pye Associates Ltd (KPAL): The official KPAL website provides downloads for original versions and Version 8.0 (compatible with Excel 2000–2010).
Academic Repositories: You can often find the software and its documentation on platforms like Zenodo or linked through the original research paper published in Earth Surface Processes and Landforms. Step 5: Interpret the Output You will see:
Modern Alternatives: For those using R, the G2Sd package is a free, open-source evolution of the GRADISTAT v. 4.0 macro, designed for modern statistical environments. Why Use GRADISTAT?
Before this software, calculating complex statistics for large datasets was a laborious manual process. GRADISTAT simplifies this by providing robust, standardized descriptive terms (e.g., "very well sorted" or "fine skewed") based on recognized sedimentological scales. This standardization is crucial for mitigating coastal erosion, managing floods, and conducting environmental impact studies. GRADISTAT software - Kenneth Pye Associates Ltd
Hydrometer results are negative or unrealistic
Fix: Ensure you have entered the blank hydrometer reading, meniscus correction, and temperature correctly. Also check that your sample weight is in grams, not kg.
What is Gradistat v 9.1?
Gradistat (Version 9.1) is a Microsoft Excel macro-enabled workbook developed by Simon J. Blott and Kenneth Pye of the now-closed Kenneth Pye Associates Ltd. (later part of Foster Wheeler). It was first introduced in the early 2000s and became the industry standard because it automated the tedious, error-prone process of calculating Folk and Ward (1957) graphical statistics, moments statistics, and the logarithmic method of moments.
Key Facts:
- Latest free version: 9.1 (sometimes written as v91 or 9.1)
- Platform: Microsoft Excel (Windows only; Mac compatibility is limited)
- License: Freeware for non-commercial, academic, and personal use
- Primary functions: Sieve and hydrometer analysis, grain size statistics, graphical output, ternary plotting (sand-silt-clay)
Option 1: Social Media (Twitter/X, Facebook, LinkedIn)
Best for sharing the news quickly with a community of researchers.
Text: 📢 New Update Alert: Gradistat v9.1 is now available!
Great news for sedimentologists and geologists! The latest version of the popular grain size analysis spreadsheet, Gradistat, has been updated to version 9.1.
✨ Why you need it:
- Completely FREE to use.
- Automates the calculation of grain size statistics (Mean, Sorting, Skewness, Kurtosis).
- Generates detailed graphs and classification data.
- New in v9.1: [Insert specific update, e.g., "Improved compatibility with Excel 365" or "Bug fixes for phi scale conversions"].
Stop doing the math manually and speed up your data analysis! Download it now and streamline your thesis or research paper.
📥 Download Link: [Insert Link Here]
#Geology #Sedimentology #Gradistat #ResearchTools #GrainSize #GeoScience #FreeSoftware