CHANGES in `usl' VERSION 3.0.3 (2022-08-27) * No functional changes; only unit tests were updated. CHANGES in `usl' VERSION 3.0.0 (2020-02-29) * Extend `scalability()` function to accept additional parameter `gamma`. * Removed R-squared in `summary()` output as it is not valid for nonlinear regression. * Implemented method `sigma` to extract the residual standard deviation. * Implemented methods `optimal.scalability()` and `limit.scalability()` to determine scalability bounds. * Print scalability bounds in `summary()` output and optionally include these bounds in the `plot()` output. CHANGES in `usl' VERSION 2.0.0 (2020-01-08) * Version 2.0.0 is a major update that includes some breaking changes. The Universal Scalability Law has evolved from the original two coefficient formula into a three coefficient formula to obviate the need for parameter normalization. The following changes are made to align the package with the current use: - The previously used coefficients `sigma` and `kappa` are renamed to `alpha` and `beta`. - A new coefficient `gamma` is introduced. This coefficient corresponds to the scale factor calculated in earlier versions when parameter normalization was used. - The `default` method of the `usl()` function is no longer a separate solver method as normalization has been removed. Calling the function with either no or the `default` value for the `method` parameter will internally use the `nlxb` implementation. CHANGES in `usl' VERSION 1.8.0 (2017-08-07) * The `nlsr` package will replace the older `nlmrt` package. The package has been updated accordingly. CHANGES in `usl' VERSION 1.7.0 (2016-10-13) * The `summary()' command now shows the t-value and the two sided p-value for the coefficients sigma and kappa. CHANGES in `usl' VERSION 1.6.0 (2016-06-17) * Remove unused parameter `R' from the signature of the `confint()' function. * Add additional section about multivalued data to vignette. CHANGES in `usl' VERSION 1.5.0 (2016-02-25) * Use method `nlxb' as fallback if the value for the scale factor is missing in the data and the `default' method is used. A warning message is printed in this case. This is more user-friendly than the error message given before. * Remove unused parameter `R' from the signature of the `usl()' function. CHANGES in `usl' VERSION 1.4.1 (2014-12-29) * Depend on `methods' package instead of importing it. This fixes a problem with calling `usl()' from Rscript. * Minor fixes concerning coding style and typos. CHANGES in `usl' VERSION 1.4.0 (2014-11-04) * Add new method `overhead()' to calculate the overhead in execution time caused by contention and coherency delays. CHANGES in `usl' VERSION 1.3.1 (2014-06-20) * Fix vignette for TeXLive 2014. CHANGES in `usl' VERSION 1.3.0 (2014-06-02) * The estimation of standard errors for the coefficients has been rewritten. Bootstrapping is no longer used for the calculation. Therefore the argument `R' for the `usl()' function and the argument `type' for the `confint()' function have been deprecated. The arguments will be removed in the next release. * Added coefficient standard errors and residual standard error to the summary output. * Added implementation for the df.residual() function to get the degrees of freedom for the model. * Removed misleading calculation of deviance. * Used roxygen2 4.0.1 to generate the documentation. * Added a new demo data set `oracledb'. CHANGES in `usl' VERSION 1.2.2 (2014-04-03) * Use roxygen2 3.1 to generate documentation. * Fix handling of unsorted input data frame for method="default". CHANGES in `usl' VERSION 1.2.1 (2013-08-12) * Adapt to `nlmrt' version 2013-8.10 CHANGES in `usl' VERSION 1.2.0 (2013-04-29) * Added function `confint()' to estimate parameter confidence intervals. CHANGES in `usl' VERSION 1.1.0 (2013-02-26) * Added a package vignette. * Use `Import' instead of `Depend' for the used packages. * Function `efficiency()' now returns a named vector. The names are the values of the independent variable, cf. `fitted()' or `residuals()'. CHANGES in `usl' VERSION 1.0.0 (2013-02-10) * Initial release on CRAN