Oversampling was performed to provide stable estimates of conditions with low prevalence.
In practice, rigorous validation of models represents major difficulties [ 86, 87], since the very purpose of modelling is to obtain estimates of conditions beyond the available observational data (including into the future): some degree of extrapolation into the unknown is therefore inevitable.
These habitat syndromes, when mapped onto the phylogenetic tree, show two major adaptive habitat shifts to high elevation grasslands (Fig. 5), presuming that the ancestor was forest-adapted in line with paleoclimatic estimates of conditions ~ 4 MYA [ 50], before a general shift to grasslands at 1.86 MYA [ 51].
In the analyses, femur length of males was used as an estimate of body size and residual of regression of body mass on femur length was used as an estimate of condition of males.
Time series analysis of estimates of chick condition revealed significant autocorrelation between condition estimates taken at two-, but not four-day intervals in both sampling years.
In the "matching" approach, a random one-to-one mapping is created between the M estimates of first condition and the M estimates of the second condition.
Until now, the most-cited estimates of the condition's cost and prevalence came from an advocacy group, the Alzheimer's Association.
Thus, estimates of chick condition were compared to meal sizes provided by parents at four-day intervals.
In an ageing society where health resources are increasingly scarce, evidence-based, population-wide, cheaply-assessed estimates of this condition are required so that effective interventions and appropriate preventive and treatment regimens can be implemented.
Selecting a short prevalence period to rule out pre-existing conditions can, through misclassification, substantially inflate estimates of incident conditions.
