Sentence examples for proved difficult to quantify from inspiring English sources

However, it has proved difficult to quantify the environmental contribution from ecological studies because the circumstances in which people live or work are partly endogenously determined.

In fact, WGA DNA proved difficult to quantify by Picogreen, likely due to the complex branched structure of the amplification product obtained.

In Canada, consumption of home-brewed alcohol proved difficult to quantify with any degree of accuracy because of widely disparate results from independent methods (MacDonald et al., 1999).

But these outcomes "specially around student learning [had] proven difficult to quantify" because the data expected to measure them had "too much missing information", the report concluded.

Notwithstanding, it may prove difficult to quantify the tangible and intangible benefits of corporate sustainability and responsibility.

The latter property has proven difficult to quantify on a materials basis because it depends on extrinsic effects.

Despite some evidence for more recent topographic uplift, it has so far proven difficult to quantify it.

Fire contributes to long-term degradation that, although significant, has proven difficult to quantify and monitor, and thus receive less attention in REDD+ negotiations compared to deforestation [28 30].

Archaeologists have previously proposed several different measures of flaked stone raw material "quality", but this variable has proven difficult to quantify, and the precise characteristics that improve performance remain unclear.

However, the changes that fibroblasts make to the material around them and the mechanical consequences of these changes have proven difficult to quantify, especially in realistic, viscoelastic three-dimensional culture environments, leaving a critical need for quantitative data.

Without malaria confirmation, it is difficult to exclude fevers, which are not due to malaria, thus the true burden of the disease proves difficult to quantify.