The data consist of weed count data on contiguous quadrats on part of an arable field in Wageningen during 3 consecutive years (2001, 2002, 2003), prior to the herbicide application. Further details on the collection of the data and the weed species described in this study can be found in detail on page 383 of publication (A). The data are presented for each year separately in *.csv and in excelfiles.

The data were collected, described, analysed and used in the following publications:

(A) Heijting, S., Van Der Werf, W., Stein, A., Kropff, M.J.(2007) Are weed patches stable in location? Application of an explicitly two-dimensional methodology. Weed Research, 47 (5), pp. 381-395. http://dx.doi.org/10.1111/j.1365-3180.2007.00580.x

(B) Heijting, S., Van Der Werf, W., Kruijer, W., Stein, A. (2007) Testing the spatial significance of weed patterns in arable land using Mead's test. Weed Research, 47 (5), pp. 396-405. http://dx.doi.org/10.1111/j.1365-3180.2007.00577.x

(C) Kruijer, W., Stein, A., Schaafsma, W., Heijting, S. (2007) Analyzing spatial count data, with an application to weed counts. Environmental and Ecological Statistics, 14 (4), pp. 399-410. http://dx.doi.org/10.1007/s10651-007-0027-y

(D) Heijting, S. (2007) Spatial analysis of weed patterns. PhD thesis. 146 p. ISBN 9789085047919 http://library.wur.nl/WebQuery/wda/1858397 http://edepot.wur.nl/121916