How to build HoltWinters and Stepwise Autoregressive time series model with constant and linear trend in R package

How to build HoltWinters and Stepwise Autoregressive time series model
with constant and linear trend in R package

References

Reference NO 1

http://stackoverflow.com/questions/15191960/how-to-build-holtwinters-and-stepwise-autoregressive-time-series-model-with-cons

Reference NO 2

http://r.789695.n4.nabble.com/How-to-build-HoltWinters-and-Stepwise-Autoregressive-time-series-model-with-constant-and-linear-trene-td4660180.html

Reference NO 3

http://www.okstate.edu/sas/v8/saspdf/ets/chap12.pdf

Reference NO 4

http://support.sas.com/documentation/cdl/en/etsug/60372/HTML/default/etsug_intro_sect027.htm

Reference NO 5

http://cran.r-project.org/web/packages/forecast/forecast.pdf

Reference NO 6

http://www.jstatsoft.org/v27/i03/paper

Reference NO 7

http://www.thinkmind.org/download.php?articleid=patterns_2011_3_30_70099

Reference NO 8

http://ideas.repec.org/a/jss/jstsof/27i03.html