Dear All,
I intend to fit spatial covariance structure to yield response
georeferenced with geographical coordinates (latitude and longitude) using
the model
Z(s) =u(s) +e(s). I have converted to projected coordinates i.e. easting
and northing in meters.
I would like to find out if it is necessary to carry out trend surface
analysis by regressing the yield on the coordinates before proceeding with
fitting the spatial covariance models.
That is yield ~easting + northing

Thank you while looking forward to your response.

Best regards
Moshood

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