Thus, it may be impossible to specify formative variables in a life-course model without reducing the overall structural model to a meaningless accumulation of linear functions.
It would be impossible to specify the joint distribution of the thousands of parameters involved in our model if we tried to model the spatial properties of PM2.5, the relationship between exposure and ambient levels, and the relationship between exposure and cardiovascular mortality simultaneously.
Indeed, it is impossible to specify what the market is in isolation from the rules that define the possibilities and terms of exchange.
As late as 1989, writing in the International Dictionary of Psychology, the British psychologist Stuart Sutherland could irascibly declare of consciousness that "it is impossible to specify what it is, what it does, or why it evolved.
Although one can assign a maximum potential life span to an individual while realizing that this maximum may not be attained it is impossible to specify the survivorship pattern unless the environment is also specified.
As recently as 1989 Stuart Sutherland wrote in the International Dictionary of Psychology, "Consciousness is a fascinating but elusive phenomenon; it is impossible to specify what it is, what it does, or why it evolved.
He acknowledged that it was impossible to specify just how many cancers were environmentally caused, because not enough research had been done, but he said he was confident that when the research was done, it would confirm the panel's assertion that the problem had been grossly underestimated.
Nevertheless, it was impossible to specify which function or sequence of operations was responsible for the effects.
For some reason, when nurses printed charts, it was impossible to specify which printer to use, and thus where the charts would emerge.
