The phrase "a subsample of this" is correct and usable in written English.
It can be used when referring to a smaller portion or subset taken from a larger sample for analysis or study.
Example: "In our research, we analyzed a subsample of this data to identify trends and patterns."
Alternatives: "a subset of this" or "a smaller sample of this".
A subsample of this population, 93 anglers with sufficient serum and complete questionnaire data, was selected for this analysis.
The number of spermatozoa was estimated by homogenizing individuals in 50 μL of medium, and counting a subsample of this suspension using a hemocytometer (Neubauer improved).
The number of parasite spores was estimated by homogenizing individual hosts in 0.5 mL of medium, and counting a subsample of this suspension using a hemocytometer (Neubauer improved).
While data were published for a subsample of this RCT [ 41], we decided to use data that were provided by the trial authors on request.
Comparison of a subsample of this population that had the least environmental contamination with the subsample having highest environmental arsenic concentrations showed small but statistically significant differences in urinary arsenic levels for all species except dimethylated arsenic.
A subsample of this population including all participants aged 55 74, and smaller samples aged 25 54 and 75 84 were invited to a more comprehensive examination called the second visit.
I'm confident that there are conditions in which at least a subsample of the population enjoys this quiet opportunity for self-reflection".
Regardless of whether or not the detected mitochondrial haplotype of Rungwecebus turns out to be characteristic for only the examined specimen (or for only a subsample of the individuals belonging to this species) the evolution of Rungwecebus has been reticulate.
Thus only a subsample of the mosquitoes collected during this period were tested for WNV.
A qualitative analysis of a subsample of the articles studied in this project found that children were characterised as in need of protection from smoking adults' behaviours [ 27].
The psychometric properties of the IES-R were found to be satisfactory in a subsample of the data used in this study [ 13].
