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  Thursday, May 03, 2007 Log Out  
Article Back To:  Home    Publication    Issue 

  

Israel Journal of Ecology and Evolution
  Issue:  Volume 52, Number 1 / January 2006
  Pages:  1 - 10
  URL:  Linking Options

On Fitting a Model to a Population Time Series With Missing Values

Oren Barnea A1, Andrew R. Solow A2, Lewi Stone A1

A1 Biomathematics Unit, Department of Zoology, Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
A2  Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA

Abstract:

Existing methods for fitting a population model to time series data typically assume that the time series is complete. When there are missing values, it is common practice to substitute interpolated values. When the proportion of values that are missing is large, this can lead to bias in model-fitting. Here, we describe a maximum likelihood approach that allows explicitly for missing values. The approach is applied to a long weekly time series of the dinoflagellate Peridinium gatunense in Lake Kinneret, Israel, in which around 35% of the values are missing.


Keywords:

ecological time series, maximum likelihood, missing values, Lake Kinneret, phytoplankton


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