I uploaded today to CRAN an updated version of tsintermittent. Yesterday I found a bug in the optimisation of the Croston’s, SBA and TSB methods and this update fixes that. Here is the changelog for this update:
Version 1.3 (04 August 2014)
* Corrected major optimisation bug - issue with opt.on in all crost,
tsb and sexsm functions.
* Corrected bug in imapa function when maximumAL was very high.
* Corrected bugs in the legend of imapa function plots.
* Added option to optimise only initial values without parameters in
crost, tsb and sexsm functions.
* Added init.opt option for imapa in the same way as it is for crost
and tsb functions. This does not affect SES optimisation.
* Added option to use pre-fitted imapa models.
If you had experienced some strange behaviour with optimising the various methods, especially SBA, this update fixes this. I strongly suggest you update the intermittent demand package to version 1.3 as soon as possible!