ASReml 4, the outstanding data analysis software designed for fitting linear mixed models is now available for download. Already widely used by scientists and researchers in the biosciences the new procedures and functionality added at version 4 will further extend ASReml’s ability to analyse large datasets and complex statistical models.
The main development is the introduction of an alternative functional method of associating variance structures with random model terms and the residual, akin to that used in ASReml-R, as an alternative to the former structural method, where the variance models were specified separately from the model terms. Using the functional specification, the variance model for random model terms and the residual error term is specified in the linear mixed model by wrapping terms with the required variance model function. The functional approach leads to a simpler, more concise and less error-prone specification of the linear mixed model, that is more automatic for specifying multi-section residual variances.
There are also many smaller changes, to improve efficiency and convenience. These include:
Users are supported by VSNi (if they have a support contract), a range of tutorials and user guides and by an active user community through the ASReml Forum. For more details on ASReml, see the new features page.
Users with current support contract or annual license are automatically entitled to this upgrade. The license software has been updated to the latest version but existing license keys should continue to work with ASReml 4, so long as the Support Version code is 1503 or higher. The License Guide explains how you can check your key and what changes might be needed, if any.
ASReml 4 is supported on the same platforms as ASReml 3. The download procedure is the same as before.
ASReml 4 downloads have been updated for Linux – please read the notes on the downloads page before installing.
To trial any of our software, please send an email to support detailing: