Although this is not an R question.... actually, if I get such a
question in our consulting centre, my advice is:
Present a table of your 4 observations and that's it from a
quantitative point of view. There is no sense in modelling or testing
with 4 observations.
Best,
Uwe Ligges
On 09.05.2011 16:20, Nicole Gross-Camp wrote:
I have what I hope is a simple question - is it possible to do time series
analysis on a small data set specifically only four data points?
I have collected human threat data (mean number of threats per kilometre
walked/ survey) every 3 months in eight different sites (four with an
experimental element and four control sites). I am trying to determine the
best way to determine if there is a trend in the data though from what I've
seen of TSA, our data set is too small. I did a simple paired t-test on the
first and average of following three surveys that shows no significant
difference but it of course ignores the detail of the latter three surveys.
I am not sure how to organize the data for importation into R. I've looked
at Crawley and one of Zuur publications but the TS data they work with is
much longer term and not over several (independent) sites.
Any advice, help, or direction is much appreciated!
Best,
Nicole
________________________
Nicole Gross-Camp, PhD
Senior Research Associate
University of East Anglia
Norwich
Rwanda: +250 (0)783647398
Skype: nicolegross-camp
Based in Rwanda from September 2010 through July 2011:
BP 512
Butare
Rwanda
personal website:
http://www.uea.ac.uk/dev/People/Research+Associate/Nicole+Gross-Camp#info
project website:
www.ReDirectRwanda.com
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