US officials have for years warned that so-called "lone wolf" terrorists, unconnected to established and monitored extremist groups, are notoriously difficult to identify in advance of an attack.
In the wake of the stock market bubble, Mr. Greenspan and other top Fed officials argued that it was a mistake to try to head off potential bubbles, in part because they are difficult to identify in advance and in part because the effort might easily cause more damage than it prevents.
It is difficult to identify in advance the number of multiple imputed data sets we will need to construct but it is likely to be between 5 and 10.
Sometimes, actually, the compassion can be difficult to identify in it because it involves hard choices.
Pseudogenes are difficult to identify in an automated manner.
Frankly, it's harder than hell to identify in advance who those right people are.
The relatively few exceptions are impossible to identify in advance.
Sometimes they are difficult to identify especially in the beginning.
However, mid-way through the pilot study, we appreciated that it was difficult to identify 3 appropriate days for yoga in advance because of acuity of illness, scheduling of tests such as computerized tomography scans and other radiological evaluations, and procedures.
In our model, the rupture propagation velocity is close to the S wave speed, and it is difficult to identify the effect of further advancing the rupture front on the seismic wave radiation.
Patients at risk of events after hospitalization are often difficult to identify [ 3]; moreover, in spite of technological advances and the search for objective, evidence-based criteria, discharging a patient hospitalized for ADHF, is still largely based on subjective feelings of the treating physician [ 4].
