The phrase "and hard to evaluate" is correct and usable in written English.
It can be used when discussing something that is difficult to assess or judge, often in contexts like research, performance, or quality.
Example: "The results of the experiment were inconclusive and hard to evaluate, making it challenging to draw any definitive conclusions."
Alternatives: "and difficult to assess" or "and challenging to measure".
Frequently, especially in engineering applications, the functions involved in optimization process are black-box with unknown analytical representations and hard to evaluate.
The functions to be optimized are often highly multiextremal, black-box with unknown analytical representations, and hard to evaluate even in the case of one parameter to be adjusted in the presence of non-linear constraints.
Companies have to commit to building a first-class team of DL CV talent, which can be especially difficult to acquire because such people are scarce, high-priced and hard to evaluate for quality.
All in all, informality aspect of employment relationships, as well as the unavailability of a written contract, has ambiguous relevance for EPL coverage: they clearly diminish the extent of effective coverage as compared to legal coverage, but the size of this reduction is country-specific and hard to evaluate on a consistent basis.
There are more people interested in art, but the standard is very confusing and hard to evaluate.
Health research capacity strengthening (RCS) projects are often complex and hard to evaluate.
It is observed that when the advection becomes dominant, the analytical solution becomes ill-behaved and harder to evaluate.
Mr Buffett runs his empire, which employs 330,000 people, with a headquarters staff that has slowly grown over the years to 24.As Berkshire Hathaway's companies get bigger, though, the internal demands for capital get larger and harder to evaluate.
The dramas are easier to execute and harder to evaluate: Zucker thinks his detective drama "UC: Undercover" may be a sleeper, although it doesn't have the industry buzz of "24," a Fox show that has both layers and a gimmick: each episode will chart one hour in a daylong assassination-plot investigation.
On the other hand, emerging market stocks are generally under-researched and harder to evaluate, offering more opportunities for an active manager to identify mispriced companies.
Care must be taken with medications, as side effects may be more common and harder to evaluate in individuals with AS, and tests of drugs' effectiveness against comorbid conditions routinely exclude individuals from the autism spectrum.
