First of all, 44 observations is a very small sample, so drawing any strong,
statistically valid conclusions is at best difficult, at worst misleading.
Non-whites were excluded, as there were too few non-white participants to draw
statistically valid conclusions.
In this study, suicidal ideation was used as the indicator of suicide risk because too few patients reported a history of suicide plan or had made a suicide attempt for
statistically valid conclusions to be made.
Not exact matches
So while their
conclusions may be
valid: yes there is no evidence of a discrepancy, given their uncertainties, and yes there is no «
statistically significant» decline in OHC rates of change, but the uncertainties are so large that neither dataset is useful to know what is really going on, and that is the key point.
Their
conclusion was that Mann's work was not
statistically valid.
For example, it's not
statistically valid for me to claim that there's significant warming in the 1998 - 2009 monthly data I show above because the R2 (representing how noisy the data is compared to the linear trend in time) is too low to draw any
valid conclusions beyond «it's effectively flat.»