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Dear list-readers We were studying lepidopteran egg parasitism rates in
a grid design (on 6 x 24 plants, totally 144) in the field. The idea was to
detect influences in terms of directional dependencies of the parasitism rate
(variograms), of base parasitism rate (nugget), and of “distance of the
effects” (range). Now egg parasitism rate was quite low and rare due to
different problems (meteorological, area, test site, spraying in field, etc) so
we have an average of 10-20 % of parasitized eggs (out of 144 points). For some
non-spatial statistical testing this was more or less ok. For the geostatistical work (I was thinking of universal
kringing), the number of values is quite little. So I was thinking about
transforming them by means of the exponential function (exp^zi), in order to
get 144 values and to retransform the result. Can I proceed in this way or am I completely on the
wrong way with this approach? Thank you very much for you attention. Best wishes Christian °°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°° Christian Schlatter GIS Pflanzenschutz: Schädlinge –
Nützlinge Forschungsinstitut für biologischen
Landbau (FiBL) Institut de recherche de
l'agriculture biologique Istituto di ricerche
dell'agricoltura biologica Research Institute of Organic
Agriculture CH-5070 Ackerstrasse CH- 5070 Frick Telefon 0041 62 865 72 75 Fax 0041 62 865 72 73 Unsere Homepage: http://gis.fibl.ch/WWFMap/viewer.htm °°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°° |
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