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Obviously, the Heckman procedure removes only biases linked to selection bias; other biases can still prevail, i.e., omitted variables, time-dynamics of big data on productivity, etc. Competitive intensity is another critical variable, but we lack firm data on the matter.
In addition, we employed methodological features to account for potential limitations linked to selection of controls.
(Gilson and Erasmus 2006, p. 17) Part of the problem was linked to selection and composition of committee members.
Whilst the impact of agricultural use of insecticides has been widely linked to selection for resistance in malaria vectors, recent evidence has also implicated petroleum products [ 22, 42].
The problem of biases linked to selection effects is very different depending on whether the objectives are analytic or descriptive [ 53].
For example, gene flow can override genetic differentiation at all loci except those that are directly under selection or are linked to selection [ 36, 37].
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This model strongly emphasizes the importance of selection on seasonal timing (phenology), and does not clearly link to selection on ontogenetic variation.
Indeed, a large dS relative to dN is linked to purifying selection; dN = dS is assumed to indicate neutrality of selection, while a dN greater than dS is associated with positive selection [ 19].
Past artificial selection of lettuce for improved yield traits is likely to be linked to indirect selection against characteristics such as AO status since phenolics are known to have a bitter taste.
The evolution of a physiological system is necessarily linked to genetic selection pressure [ 38], and the current literature is silent as to what selection pressure would have driven the evolution of systems to regulate physical activity.
Plants and animals can evolve to adapt to these changes if climate variability is linked to natural selection.
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