The phrase "is not able to quantify" is correct and usable in written English.
You can use it when discussing the inability to measure or express something in numerical terms.
Example: "The researcher concluded that the emotional impact of the event is not able to quantify using standard metrics."
Alternatives: "cannot measure" or "is unable to assess."
It is not able to quantify the size of any losses.
The current setting is not able to quantify the power of the adversary and thus leads to extremely high requirements.
Yet, such heterogeneity index is not able to quantify the surface patterns of a landscape with a fully explicit scheme at each place and scale of the landscape.
"The company has concluded with a fair degree of certainty that information for fewer than 383 million unique guests was involved, although the company is not able to quantify that lower number because of the nature of the data in the database," according to the statement.
However, this method is not able to quantify a potential consumer surplus.
The current study is not able to quantify the relative importance or effect of each of these elements.
Compression experiments are not able to quantify the ductility of a material, which is defined as the ability to deform under tensile stress, so pillar bending experiments were used to measure plastic strain-to-failure (see Supplementary Methods for detailed experimental techniques).
Authors generally did not attempt or were not able to quantify all the different types of costs and inputs (e.g., time and funds invested to monitor the delivery of health services, time spent filling out forms).
Although we are not able to quantify reaction kinetics using NMR data due to the lack of resolution and complicated nature of the spectra, NMR allows us to gain distinct structural information and to monitor the dissolution of amorphous starting materials that are undetectable by XRD.
However, we were not able to quantify any differences in proliferation, apoptosis, or necrosis between CX and vehicle treated tumors at the end of the study (day 21).
Palmitate synthesis from de novo lipogenesis may however have been overestimated in the current study because we were not able to quantify the contribution of chain elongation to the synthesis of this fatty acid.
