The phrase "are difficult to infer" is correct and usable in written English.
It can be used when discussing information or conclusions that are not easily deduced or understood from available data or context.
Example: "The underlying motivations behind their actions are difficult to infer without further context."
Alternatives: "are hard to deduce" or "are challenging to ascertain".
While the composition of the SC lipid matrix is known, the molecular-level details of its organization are difficult to infer experimentally, hindering the discovery of structure-property relationships.
Since such decisions require knowledge of application semantics that are difficult to infer automatically, our tool provides an interactive visualization of partitioning results, as shown in Figure 2(a) and (b).
Although the evolutionary traits are difficult to infer, in the case of GHF10 and 11, the symbiont sequences are relatively closely related to each other in each tree.
Consequently, gene trees affected by transfer are difficult to infer accurately.
This suggests eukaryote-to-eukaryote gene transfer events, although the donor and recipient lineages are difficult to infer.
This is somewhat arbitrary cutoff, but avoids very early duplications in the phylogenies, for which mechanisms are difficult to infer.
Therefore, it is difficult to infer large scale networks using traditional statistical methods, limiting this inference to only a few genes.
If the detected deletions are true, it is difficult to infer whether they existed at the time of original infection, or resulted from a subsequent laboratory adaptation.
"Obviously babies can't tell us about their experience of pain and it is difficult to infer pain from visual observations," said Rebeccah Slater, a doctor at Oxford's paediatrics department who led the study.
Observational database research frequently relies on imperfect administrative markers to determine comorbid status, and it is difficult to infer to what extent the associated misclassification impacts validity in multivariable analyses.
These numbers are grouped into size bins and from these it is difficult to infer the size distribution of private sector firms.
