Although concentrations of PAHs in residential dust were moderately correlated between sampling rounds, there was substantial unexplained within-household variability.
Finally, despite our attempts to minimise measurement error by means of reader training and blinding, it is possible that this still represents a substantial component of the unexplained within-individual variability.
To assess site-to-site variations in the MRI data, we bootstrapped the random effects residuals of the fits (i.e. the unexplained within-person variation and noise) and evaluated differences between the MRI centres by analysis of variance.
If past levels of chemical exposures are of interest and sample collection must be carried out after disease diagnosis (e.g., case control studies), large unexplained within-household variability over time is problematic.
The total outcome variation is partitioned into that between patients but within GPs and that between patients but within areas, which indicates to what extent the unexplained variation within the model pertains to differences across either GPs or areas.
When the model has run the total outcome variation is partitioned into that between patients but within surgical teams and that between patients but within Trusts, which indicates to what extent the unexplained variation within the model pertains to differences across surgeons or Trusts.
The first paranormal events apparently occurred in about 1863, since a few locals later remembered hearing unexplained footsteps within the house at about this time.
These additional variables accounted for previously unexplained variation within and independent of tumor stage, and resulted in a more accurate assessment of the risk for treatment failure when evaluated as integrated prognostic indicators.
There remained significant unexplained heterogeneity within each type of study design.
Altogether, these results may reflect a complex and so far unexplained interaction within this specific subgroup between diabetes, comorbidities, GPs' treatment and patients' health behaviour.
