But the US is unique in its attitude toward guns, making it difficult to compare to other countries.
However, few of the instruments were directly comparable because their response scales varied, making it difficult to compare the responses.
A wide variety of reference standards and comparators has been used for validity assessment, making it difficult to compare instruments.
In addition, each resort had its own procedure for classifying and recording injury events, making it difficult to compare results between areas.
Most deals are done in private, making it difficult to compare prices or identify problems.
Also, different studies have used different doses and parts of the herb, making it difficult to compare results.
Missing code and data are making it difficult to compare machine-learning work and that may be hurting progress.
Further, because there is no standard definition, research groups vary in the definitions they use for NVLD, making it difficult to compare results between research studies.
Also, the state exam was new, making it difficult to compare achievement gains to past trends.
However, the electrical cortical responses were not recorded in this study, making it difficult to compare with our results.
Second, different host cells were used in these studies, making it difficult to compare the results obtained.
