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Version 0.4.0 [2024-04-01]

changes

• diffusion is now released under LGPLv2.1. The previous version under GPL(>=2) can be downloaded from here: https://github.com/mamut86/diffusion/releases/tag/v0.3.1

Version 0.3.1 [2024-03-30]

changes

• new automated removal of leading and trailing NAs. Error abort if NA within series
• new search optimisation argument (multisol)
• new option to partially fix/optimise parameters w in both diffusion and seqdiffusion
• new bootloss argument to control fo r different loss function of the bootstrapping
• added documentation for tsMetal.RData
• added internal sum squared error function for the optimiser
• added passing optim setting int trough Gompertz and GSGompertz initialisation
• added error handling for optimx function
• renamed argument l to loss (for l-norm selection)
• renamed argument x to y (the response variable)
• renamed argument optim to method (the optimiser selection)
• introduced argument initpar to allow manual initialisation, preset and automatic
• introduced argument mscal to scale market potential for better optimisation results
• introduced argument bootloss to choose from different loss function for bootstraps
• changed non-critical warnings to type message, to allow easy suppression
• is.diffusion() and is.bass() functions
• renamed option variable l to loss (for l-norm selection)
• renamed option variable x to y (the response variable)
• updated documentation for diffusion() - Thx Ivan!
• removed tsBroadband dataset due to data privacy concerns
• new search optimisation option

bugfixes

• issues with log errors - reverted error measure to v.0.2.7 for the time being
• fixed an initalisation issue on the weibull model
• fixed titles for graphs
• fixed typo in documentation for predict function
• fixed fcst table to contain same number as horizons
• fixed number of parameters that go into G/GS (only relevant if w.idx is active)
• fixed error when plot.seqdiffusion() was used with cleanlead = F
• fixed error in gompertz when cleanlead = F
• fixed the tsmetal issue - the object now has the correct name
• fixed error when plotting ts-object with cumulative = F
• fixed an error when eliminate was TRUE with 0 pval reps to stop.
• fixed the sequential diffusion pval elimination process
• fixed error when linearization fails and reverting now to preset
• fixed error when bootstrapping produced NA now ignoring NA and warning.
• included error check for pvalreps in seqdiffusion
• included error check for y to be vector or ts-object / matrix or mts for seqdiffusion
• included a revert method in case optimization fails and warning messages

Version 0.3.0 [2018-04-30]

changes

• added Weibull curve
• Changed the optimisation errors to log

Version 0.2.7 [2018-01-05]

changes

• update description file

Version 0.2.6 [2018-01-05]

bugfixes

• fixed dataset urls

Version 0.2.5 [2018-01-04]

changes

• updated naming for datasets
• merged examples into main code

Version 0.2.4.001 [2018-01-04]

changes

• renamed sgompertz function to gsgompertz to reflect the correct name Gamma/Shifted Gompertz
• fixed some missing functions in norton-bass function
• Fixed roxygen2 documentation
• Fixed datasets
• Added difcurve function to produce curves for given parameters
• Reintroduced predict, print and plot functions for diffusion objects
• Created new diffusion class for outputs of diffusion()
• Hidden (until fixed) seqdiffusion and norton-bass

Version 0.2.3 [2017-05-27]

changes

• Added method predict() for diffusion models
• Added maxiter and tolerance option control
• New option np in predict() which allows to generate new product forecasts with 0 data

bugfixes

• Fixed print issue for Gompertz

Version 0.2.2 [2017-05-16]

changes

• Updated some of the documentation so it contains information about the new optim = parameter
• introducing optim paramter choice to allow for Nelder-Mead or Hooke-Jeeves method

bugfixes

• Fixed various RoxyGen2 issues and
• Fixed plotting issue
• Added print and plot to Namespace

Version 0.2.1 [2017-04-11]

changes

• Updated some of the documentation so it includes details about parameter order of S-Gompertz
• Replaced if statements with switches where necessary - closing Issue #1
• Updated the optimisation process. This should give better results but still not perfect
• Added better commented for diffusionPlot() function - closing Issue #2
• Open tasks in News depreciated and now tracking them with Issues on github
• All the parameter optimisation are now using Subplex algorithm from the nloptr package

bugfixes

• In diffusion() When providing w, pval length was not using the right parameter
• Several small variable name errors due to the integration

Version 0.2.0 [2017-04-05]

changes

• Introducing shifted-gompertz model to the diffusion() function

bugfixes

• Some typo in the print out function fixed
• carstock.RData file should now be available

Version 0.1.0 [2017-03-30]

changes

• Depreciating function Bass() and Gompertz()
• Introducing function diffusion() and seqdiffusion (kindly donated by N. Kourentzes)
• Added dataset safari
• Added dataset windows
• Added cost function for Norton-Bass model
• Included curve fitting into Nortonbass() function
• Added curve fitting ability and insample error estimation for the Gompertz curve
• Added data “broadband”
• Added curve fitting and insample error estimation for Norton-Bass model

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.