The phrase "is difficult to infer" is correct and usable in written English.
It can be used when discussing something that is hard to deduce or understand based on available information.
Example: "The meaning of the poem is difficult to infer without knowing the author's background."
Alternatives: "is hard to deduce" or "is challenging to understand."
Therefore, it is difficult to infer large scale networks using traditional statistical methods, limiting this inference to only a few genes.
These numbers are grouped into size bins and from these it is difficult to infer the size distribution of private sector firms.
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.
While it is difficult to infer the effect of changing planetary conditions on organisms, communities and ecosystems, great changes were happening at the end of the Precambrian and the start of the Early Cambrian.
In general, it is difficult to infer how important these changes might be.
However, it is difficult to infer more information on recent H. pylori evolution from the H. acinonychis mutations because the sequences have been changed to a great extent.
In the absence of reliable universal molecular clock in bacteria [39], it is difficult to infer divergence times for the different evolutionary steps.
Since the rate of sequence divergence in introns is very high, it is difficult to infer the source/mechanism of such spatial differences between distantly related species [65].
In the absence of high resolution structures of the wt and mutant AChRs it is difficult to infer specific structural events based on the functional effects of mutations.
The timing (i.e., before or after the Holocene climate change) of short-flowering-time evolution in this region, however, is difficult to infer from our data.
However, it is difficult to infer the relative importance of each factor to disease from the GENN weights alone because the weights will change with tweaks to the architecture of the neural network.
