"lack of comparisons" is a correct and usable phrase in written English.
You can use it when you want to express the idea that something or someone is not being compared to anything else. For example, "The student's essay suffered from a lack of comparisons to other works in the field."
It is interesting to observe that there is a lack of comparisons of the military capacity between these two countries.
These discrepancies may largely reflect the lack of comparisons across differentially categorized groups.
This lack of comparisons on actual syndromic surveillance data makes it difficult to select aberration detection methods objectively.
We surmise that the efficacy of barcoding in plants has often been overestimated because of the lack of comparisons among closely related species.
Several methodological challenges, such as small sample sizes, non-representative samples, and lack of comparisons with normative data limit the interpretation of many studies.
However, the value of the results is limited by the small number of patients included, the lack of comparisons or controls, and the small burn size.
The fifth limitation was the lack of comparison with a control group.
The limitations of this study include its retrospective nature as well as the lack of comparison group.
The findings need also to be interpreted cautiously for the lack of comparison to concurrent untreated controls.
There is an immense lack of comparison studies in the area and the evidence of recommending either open or arthroscopic surgery is still lacking.
However, traditional methods always have some defects, such as high failure rate, indefinite and inaccurate result in the test, and lack of comparison.
