In a sense, our current categorisation of reward size already combines rewards that are up to and including the average reward size across the three reward steps under the "small" reward condition, and rewards that are larger than the average in the "large" reward condition (in Figure 2 and also in Methods, in the subsection "Reward Schedule").
Finally, there is another very interesting aspect to this paper, namely the categorisation of tumour size.
To address the effects of trial size in addition to the categorisation of small and large trials we will do funnel plots based on sample sizes.
Using Cohen's categorisation, the effect size in the larger trials of interventions for LBP tend to be only small-to-medium in magnitude [ 7].
I get lost somewhere in the ensuing categorisation of leaf sizes - and seek light relief in cup of golden Pekoe.
12 15–17 Several threats to validity have been identified, including inadequate sample sizes, data-driven or arbitrary categorisation of continuous predictors, inadequate statistical modelling of non-linear relationships, inappropriate handling of missing data, and failure to check model assumptions.
"This may be due in part to the types of device in the studies, the definition of frail elders, the sample size, the region, and the types of categorisation in variables" [[ 28], p.143].
To investigate dose-response effects, analyses were then carried out in the subset of respondents living within 150 m from a road with distance fitted as 50 m bands (the smallest categorisation possible given the study sample size).
It is also of interest to study survival differences in narrow prognostic categories, to ascertain whether the difference can be better explained by more minute categorisation of factors such as tumour size, and whether the survival advantage of screen-detected tumours is more marked in higher risk or lower risk tumours.
We recognise the potential value in treating reward size in a continuous manner and testing different categorisations.
In an interview with Elle magazine, 5ft 11 Dalbesio was described as "surprisingly" a "plus size" model in terms of the fashion industry's categorisations.
