The phrase "are unable to include" is correct and usable in written English.
It can be used when expressing a limitation or inability to incorporate something into a particular context or situation.
Example: "Due to time constraints, we are unable to include all the necessary details in the report."
Alternatives: "cannot incorporate" or "are not able to add".
But since Romney hasn't released any details of which tax shelters he would target, and where the burden would fall, analysts such as those at the Tax Policy Center are unable to include them in their analyses.
Due to the small sample size, we are unable to include descriptors regarding the participants so to preserve their anonymity.
Since the paper builds upon data collected for a study exploring gender-specific health behaviour (mammography screening), we are unable to include the perspectives of elderly migrant men.
As population and IMD data originate from the 2001 census, we are unable to include LSOA-level offsets corresponding to individual years in this model.
Further, there may be other area-level factors, which we are unable to include in our model, which are also associated with lower injury rates and higher proportion of smaller workplaces.
We were also unable to measure nonmedication treatment decisions physicians make; in response to poor control, physicians may provide diet, exercise, and other lifestyle recommendations that we are unable to include in our analysis.
Jensen acknowledged dryly that the film would be "unable to include a tag saying that 'no animals were harmed' " during its production.
They were unable to include Fujian A, the strain that is widespread in the West, in this year's vaccine, because it was detected too late for production.
The researchers were unable to include family history of diabetes, physical activity, alcohol use and specific dietary risk factors in their research.
In the previous column, Priceline explained why it was unable to include those fees in the rates it publishes on the site.
