`NEWS.md`

github repository housekeeping - switched from TravisCI to Github actions.

now the pkgdown website is automatically rebuild on push (via a github action).

import again FKF (support for it was removed when FKF was temporarily archived on CRAN).

removed developers’ comments that had been accidentally left in a vignette.

removed an erroneous

`rev()`

from the garch tests vignette.added new tests and fixed several bugs in the process.

the show method for class “ArmaModel” now returns NULL. The previous return value was spooking “pkgdown::build_site()” resulting in the error:

```
Error in UseMethod("replay_html", x) :
no applicable method for 'replay_html' applied to an object of class "c('double', 'numeric')"
```

- relaxed numerical comparisons in some tests, to account for additional platforms, such as Open-BLAS, recently activated for checks on CRAN.

new test for GARCH-type noise based on Kokoszka and Politis result.

more complete sets of methods for several functions. In particular, there was infinite recursion in some cases.

bug fixes

improved

`show()`

methods for autocovariance objectsnumerous changes in

`sarima()`

cater for changing function names in the forthcoming release 2.0.0 of package

`PolynomF`

.Now require

`lagged (>= 0.2.1)`

(`lagged 0.2.0`

is not sufficient since`nSeasons()`

and`nSeasons<-()`

accidentally were not exported by it).Vignette

`garch_tests_example`

now imports the data using`system.file()`

, so that the examples can be run easily by the user.new function

`makeArimaGnb()`

for setting up the state space form of ARIMA models. It is a modification of`stats::makeARIMA()`

with Georgi’s method for computation of the stationary part of the initial state covariance matrix. The methods implemented in`stats::makeARIMA()`

are commented out since they are not exported from package`stats`

.`sarima()`

gets an argument to specify the method to use for the stationary part of P0 (see above). The available options are the ones in`makeARIMA()`

(“Rossignol2011” and “Gardner1980”) plus Georgi’s method (“gnb”). The default is “Rossignol2011”.

- updated Makevars and Makevars.win to deal with a NOTE from recent tightening of checks on CRAN (see https://stat.ethz.ch/pipermail/r-package-devel/2018q3/003030.html).

`NEWS`

becomes`NEWS.md`

and uses markdown syntax. The style is loosely based on http://style.tidyverse.org/news.html).-
manually incorporated or noted changes from Jamie’s 0.7.4.9001/2018-08-17. Namely:

- Import package
*numDeriv*(for`hessian()`

).

- Import package

dealt with ‘valgrind’ warnings (had missed one uninitialised warning).

fixed a bug in prepareSimSarima() - when initial values were not supplied in the stationary case, the initialisation was not correct (thanks to Cameron Doyle for reporting this).

this is an emergency release to avoid the package being archived on CRAN due to the archival of a dependency.

the main new feature since the previous release, 0.5-2, of the package is the versatile function

`sarima()`

, which provides formula syntax for fitting encompassing SARIMA, ARUMA, XSARIMA, Reg-SARIMA, ARMAX models. Parsimonious multiplicative specifications are supported for the stationary and non-stationary parts of the model, as well as arbitrary unit roots on the unit circle, which can be fixed or estimated. ‘sarima()’ is documented but is still under development.removed ‘portes’ from Imports - it was not used for some time in ‘sarima’ (it was scheduled from removal from CRAN on 2018-07-30).

removed package ‘FKF’ from Imports, since it has been archived on CRAN.

merged branch models with master.

numerous consolidations.

Changes in branch ‘models’

in DESCRIPTION, moved ‘methods’ from DEPENDS to Imports.

various bug fixes and cosolidations.

improvements to the documentation.

returned the stuff the test package ‘testts’ (and removed the latter).

`testts`

was not helpful and complicated the workflow. Now the tests for`armaQ0`

etc are in `sarima.

now can request estimation of components with roots on the unit circle.

in xreg and regx specifications, renamed cs(), B(), p() to .cs(), .B(), .p(), respectively.

further to the above, in xreg and regx specifications `t’ stays as is for now, since it needs more care, but its use is discouraged.

removed sincos() and L() from sarima specifications, use the equivalents .cs() and .B(), respectively.

intermediate versions, not useful for back reference (the zip file given is a better place to look for code before 0.6-6).

now on bitbucket as part of sarima_project. The original upload is in sarima_project/Archive/sarima_project_Orig.zip.

wrapping up 0.6-5 before making the changes needed for estimation of unit roots.

support for tanh transformation.

factorisation of MA

Packing up this version before moving stuff that needs ‘:::’ calls elsewhere (e.g. to myRcpp, but haven’t decided on the structure)

Several bug fixes.

Some trouble with Rcpp, further trouble with Rtools after installing the latest version of R. Packing up this version for a working reference.

included some C++ code (using Rcpp/RcppArmadilo) previously tested in my (private) package myRcpp.

removed the internal arima() functions introduced in 0.5-11.

added ss.method = “sarima” to sarima() which uses the new C++ functions to compute the likelihood. Limited testing confirms that this method gives the same results as arima() for models that can be fitted with arima().

bumping the version number to have a working version in case further improvements mess things up.

- temporarily created a number of functions to call functions used internally by arima(), see arima.R.

moved temporarilly FitAR from Imports to Depends, since FitARMA can’t find some functions from FitAR if FitARMA is not attached. (move back to Imports when Ian imports FitAR in FitARMA’s namespace)

further work on sarima(), saving before more meddling with the environments of the formulas

added support for KFAS.

fixed parameters and initial values are supported for ARMA specifications (but not for regression parameters yet).

sarima() is still incomplete but is usable.

archiving before a full scale consolidation and clean up, in case that messes things up.

sarima() now fits XARIMAX models, in the case of the second X, using FKF::fkf().

archiving before starting work on completing the handling of fixed parameters.

- some consolidation of sarima(), now supports lagged variables and calls only sarimat(). sarima0() has been removed. the data argument of sarima() is processed properly (incomplete maybe).

- sarima() now uses the facilities of package Formula to process the model formulas.

- sarima() can now fit time regression. It currently calls sarimat() if there is treg argument and sarima0() otherwise.

model formulas for SARIMA models using package Formula.

usable version of sarima() function but not for publication yet.

packing this version before further work on sarima().

plot of acf tests now uses different ‘lty’ so that the confidence limits under iid and garch nulls are visually distinguishable in black and white printouts.

plot of acf tests now accepts argument ‘interval’ to produce rejection limits for levels other than the default 95%.

started to add references to the documentation.

for armaacf() and armaccf_xe() the innovation variance in argument ‘model’ is now called ‘sigma2’ (the old ‘sigmasq’ still works but is deprecated).

a number of corrections and additions to the documentation.

additional examples.

SarimaModel now inherits from VirtualSarimaModel (it was inheriting from VirtualFilterModel. On its own, this is invisible to the user. It didn’t invalidate existing objects either.

new class “VirtualIntegratedModel”.

new functions nUnitRoots() and isStationaryModel.

further streamlining.

exported functions related to Bartlett’s formula (they were there in version 0.4-5, under different names).

substantial work on SARIMA models and their documentation.

increasing the version number before some streamlining of class SarimaModel.

moved “Lagged” to a separate package, “lagged”.

streamlined acfIidTest() and documented it properly.

new vignette based on example in Chapter 7 of James Proberts’ MMath project.

first submission to CRAN.

- revamped “Lagged”: introduced Lagged2d, etc.; mixed Ops, e.g. “Lagged” + “vector”, now work only if “vector” is of length one or multiple of the length of e1@data has the same length as the vector.

- removed some old commented out code from sarima.org to reduce clutter.
- extensive changes and consolidation.

- streamlined SARIMA models and the functions based on old code. Keeping the old code (commented out) for reference.

- defined the classes for autocorrelations and similar.
- autocorrelations() and similar now have a number of methods.
- passes ‘R CMD check’. Most classes have only fake documentation in VirtualMonicFilter-class.Rd.

- switched to package PolynomF (from polynom).
- new classes for models, including ARMA and SARIMA.
- R CMD check passes 9only a WARNING for undocumented objects and S$ methods.

- added new classes, substantial extension.
- renamed sarima.sim() to sim_sarima()