[R] bi-monthly time series

[Duncan Mackay]

Hi Michael

What about using zoo you can convert to ts if required

library(zoo)

tv <- seq(as.Date('2005/01/01'),as.Date('2013/01/01'),by=14)

zt <- zoo(vec,tv)
head(zt)
2005-01-01 2005-01-15 2005-01-29 2005-02-12 2005-02-26 2005-03-12 
         1          0          0          0          1          1

Regards

Duncan

Duncan Mackay
Department of Agronomy and Soil Science
University of New England
Armidale NSW 2351
Email: home: mackay at northnet.com.au

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Michael Friendly
Sent: Friday, 21 February 2014 06:04
To: R-help
Subject: [R] bi-monthly time series


The vector, vec, below represents a time series of the number of some 
events recorded
for 208 two-week intervals from 2005/01/01 up to the end of 2012.  I 
want to
represent this together with the date information.  I tried ts(), but 
don't quite understand
how to use the start=, end= and frequency= arguments in this case.

vec <- c(
1L, 0L, 0L, 0L, 1L, 1L, 1L, 0L, 2L, 0L, 1L, 0L, 3L, 1L, 1L,
2L, 0L, 0L, 1L, 0L, 0L, 0L, 3L, 0L, 2L, 0L, 1L, 0L, 1L, 0L, 0L,
1L, 1L, 0L, 1L, 0L, 1L, 1L, 0L, 0L, 3L, 0L, 0L, 3L, 1L, 1L, 1L,
0L, 1L, 1L, 0L, 1L, 1L, 0L, 0L, 0L, 3L, 0L, 1L, 1L, 1L, 0L, 0L,
0L, 1L, 0L, 0L, 0L, 0L, 2L, 0L, 0L, 1L, 0L, 0L, 0L, 2L, 1L, 0L,
1L, 0L, 1L, 0L, 1L, 0L, 1L, 1L, 0L, 0L, 0L, 1L, 0L, 0L, 1L, 0L,
0L, 1L, 1L, 0L, 1L, 0L, 2L, 0L, 2L, 0L, 1L, 1L, 0L, 0L, 0L, 0L,
2L, 0L, 1L, 1L, 0L, 0L, 2L, 0L, 0L, 0L, 0L, 1L, 0L, 0L, 1L, 1L,
0L, 1L, 0L, 1L, 0L, 1L, 1L, 0L, 2L, 0L, 1L, 1L, 0L, 1L, 0L, 0L,
0L, 1L, 1L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 1L, 0L, 1L,
0L, 0L, 1L, 1L, 1L, 2L, 0L, 1L, 1L, 1L, 0L, 0L, 2L, 0L, 0L, 0L,
0L, 1L, 1L, 1L, 0L, 1L, 0L, 1L, 0L, 0L, 0L, 0L, 1L, 2L, 0L, 0L,
1L, 0L, 0L, 0L, 2L, 1L, 1L, 0L, 0L, 0L, 0L, 0L, 1L, 1L, 1L, 1L,
0L)

This is what I tried, but it doesn't seem right because str() reports 
... to 2014.

 > vec.ts <- ts(vec,
+ start=c(2005,1),
+ frequency=24
+ )
 >
 > str(vec.ts)
  Time-Series [1:208] from 2005 to 2014: 1 0 0 0 1 1 1 0 2 0 ...
 >

If instead of a time series, I attached date names to the observations, 
they would be something
like

names(vect) <- seq(as.Date('2005/01/01'),as.Date('2013/01/01'),by=14)

but that's awkward to work with.

-- 
Michael Friendly     Email: friendly AT yorku DOT ca
Professor, Psychology Dept. & Chair, Quantitative Methods
York University      Voice: 416 736-2100 x66249 Fax: 416 736-5814
4700 Keele Street    Web:   http://www.datavis.ca
Toronto, ONT  M3J 1P3 CANADA

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