The proportional hazards model is based on the assumption that events occur independently, which clearly is doubtful when subjects contribute more than one event each.
In a recent paper written by Hilbe et al (BMC vet res, 2009), the nature and specificity of the prion protein deposition in the kidney of feline species affected with feline spongiform encephalopathy (FSE) were clearly considered doubtful.
"Adding to this, a drug which has not been approved by regulatory authorities for the treatment of MS in a dose which has not been clearly defined is doubtful regarding any derived conclusions". The sample size of patients taking Gilenya in the study was too small to provide "any meaningful statistical significance," Novartis said, and its data show approximately 90% adherence to the therapy.
Unless he is just completely unaware of his surroundings, which is doubtful, then clearly he wants everyone to know exactly what he thinks: after all, he is at a conference with a whole heap of journalists.
For hybrid interpretivism now seems to recommend that judges extend the effect of any norms they find (or at least the ones not bad enough to fail the test of consistency with even the least acceptable scheme of principle) into situations the norms don't explicitly or clearly regulate, and it's doubtful that some political ideal should support this conservative policy (Raz 1986: 1111, 1994: 224).
The visual assessment was based on the following evaluation score: 0 = no reaction, ± = doubtful erythema, + = clearly visible erythema, ++ = strong erythema and/or papules, +++ = strong erythema plus dense papules and/ or vesicles, ++++ = strong erythema plus bulla or necrosis.
Though clearly he'd broken through, it's still doubtful he -- or anyone else -- could have predicted the level of success that was to follow.
Thus, the claim that "People who enter medical fields clearly had alternatives" is debatable and sometimes even doubtful.
"Clearly, we are getting support from places that were doubtful when I arrived here.
But if an independent investigator ostensibly couldn't find enough evidence to clearly implicate the president in a crime, it's doubtful a deeply divided Congress will.
(Indeed, it is doubtful whether Neurath's radical fallibilism, most clearly expressed already in 1913, ever wavered).
