similar to: R and time series

Hi, I'd like to know if the Holt-Winters function in R can modify the alpha paremeter in an "intelligent" way. I know it can vary from 0 to 1. Wich mathematical formula does it use to calculate the correct value of alpha? Thanks, bye. Carlo

I'm trying to find a good open source software to do sales forecasting using Holt Winters and Box Jenkins time series algorithm. Somebody pointed me that R is the best open source available for statistical computing. Are there functions to do Holt Winters and Box Jenkins time series prediction in R? If there is none, can some one point me a good GNU/freeware to do the sales forecasting using

Hello, I asked this question on the r-finance list server and didn't get a reply. Thought I would try here to. I am trying to deseasonalize some financial time series data and I wanted some feedback on the best methods for doing this. I found two Centered Moving Average and Holt-Winters. Which is better and/or more appropriate for financial time series data in your opinion? I understand

Hi R-users, I have a question relating to the HoltWinters() function. I am trying to forecast a series using the Holt Winters methodology but I am getting some unusual results. I had previously been using R for Windows version 2.7.2 and have just started using R 2.9.1. While using version 2.7.2 I was getting reasonable results however upon changing versions I found I started to see unusual

Dear helpers I'm having a problem with function HoltWinters from package ts. I have a time series that I want to fit an Holt-Winters model and make predictions for the next values. I've already built an object of class ts to serve as input to HoltWinters. But then I get an error; I've used HoltWinters a lot of times and this never hapened > data.HW<-HoltWinters(data.ts) Error

Dear R Helpers, Currently I'm working with the ts package of R and created a TimeSerie from pixels extracted from satellite imagery(S10 NDVI data, 10 daily composites). I'm trying to decompose this signal in different signals (seasonal and trend). When testing out the STL method is says => Only univariate timeseries are allowed, but the current Timeserie I'm using is univariate!

1. This is an imaginary data on monthly outcomes of 2 years and I want to forecast the outcome for next 12 months of next year. data Data1; input Yr Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec; datalines; 2008 12 13 12 14 13 12 11 15 10 12 12 12 2009 12 13 12 14 13 12 11 15 10 12 12 12 ; run; I converted the above data into the below format to use it in R as it was giving error: asking

Hello: I have done this before but cannot figure out how to do it again. I would like to graph campaign evolution of news stories on certain topics. The campaign time period is as follows: campaign<-seq.Date(from=as.Date('2011-09-06'), to=as.Date('2011-10-5'), by=1) I have a table of newspaper story frequencies containing a certain word that can be turned into a data.frame

An update on this: I just patched HoltWinters() to use optimize() in the univariate case, and it now computes the correct value. David John Bodley wrote: > Hi, > > Thanks for the quick response. I upgraded by version of R on Windows to the > latest (2.7.0) and re-ran the analysis and get the same result of 48.87989. > > The original time series was a non-regular zoo()

Hi, how can I read, using for example read.table() or scan(), just one column from a text file that has more columns without any header? Thanks, bye.

A rather strange situation here and I've not found the source of the problem. The point is to print a ternary plot matrix of compositional data with ellipses enclosing 95% of the variance in each plot. The ellipses display on the monitor, dev = x11cairo (see attached winters-x11cairo.pdf), but not when sent directly to a file, dev = pdf (see attached winters-pdf.pdf). Here's

I'm trying to understand the python binding api in the samba-3.0alpha24 snapshot. In trying to get the security descriptor of a file, I have the following bit of code: from samba import smb creds = {...} # domain,username,password cnn = smb.connect("svr1") cnn.session_request("svr1") cnn.negprot() cnn.session_setup(creds) cnn.tconx("c$") fnum =

I have read ?zoo but am not sure how to relate the parameters (x, order.by, frequency, and style) to my data.frame. The structure of the data.frame is 'data.frame': 11169 obs. of 4 variables: $ stream : Factor w/ 37 levels "Burns","CIL",..: 1 1 1 1 1 1 1 1 1 1 ... $ sampdate: Date, format: "1987-07-23" "1987-09-17" ... $ param : Factor w/

Dear UseRs! We are pleased to announce the release of our new package 'PVAClone'. The 'PVAClone' package implements Population Viability Analysis (PVA) methodology using data cloning. The data cloning algorithm by Lele et al. (2007, 2010) is employed to compute maximum likelihood estimates of the state-space model parameters and the corresponding standard errors, heavily

Dear UseRs! We are pleased to announce the release of our new package 'PVAClone'. The 'PVAClone' package implements Population Viability Analysis (PVA) methodology using data cloning. The data cloning algorithm by Lele et al. (2007, 2010) is employed to compute maximum likelihood estimates of the state-space model parameters and the corresponding standard errors, heavily

please i've a big problem. i've to do a econometric-quantitative methods assignment about the canadian lynx, the problem is that i really i don't know how to use r and how to apply all the steps. I begun the time plot, ACF and PACF but i'm not able to decide what is the correct model of ARIMA, Holt-winter, ecc to forecast the next 20 years of canadian lynx's cyle... if someone

Hi Roy and calin.kalinix.cosma, Thanks for your help all the given to me. Finally, I got it done. Binding an ip address to an username with SQUID and limiting access of some users with their ips to a few sites rules added to squid.conf file external_acl_type ip_user %SRC %LOGIN /usr/lib/squid/ip_user_check -f /etc/squid/ip.conf acl ncsa_users proxy_auth REQUIRED acl ip_users external

Hi, I'm a technology reporter for IDG News Service and I'm looking for information on the 1.0 release of Ogg Vorbis. Who can I contact and where can I find more information? Thanks, Scarlet Scarlet Pruitt US Correspondent IDG News Service 3 Post Office Square, 4th Floor Boston, MA 02109 Tel: +1-617- 239-7828 Fax:+1-617-423-0712 The IDG News Service is the internal newswire for IDG. With

Hi , I am now running squid with ncsa_auth. I have bound ip addresses to usernames. So users now can access Internet from their ips. Now I want a few users to prevent from accessing all the sites. But Instead, I want them to allow to access a few sites scuh as google.com,cnn.com, bbc.com. I want to limit in that way. I have wriiten below rules. But those users still can access all the sites.

Hi all: I get the following error message that I am not able to resolve. Error in if (const(t, min(1e-08, mean(t)/1e+06))) { : missing value where TRUE/FALSE needed It appears right before the last data.frame statement. Below is the program that simulates data from one way random effects model and then computes normality and bootstrap confidence interval for