The phrase "a subsample of approximately" is correct and usable in written English.
It can be used when discussing a smaller portion of a larger sample, particularly in research or statistical contexts.
Example: "The study analyzed a subsample of approximately 200 participants to draw more specific conclusions."
Alternatives: "a sample of about" or "a subset of roughly".
After carefully mixing the sample in the sampling bag, take a subsample of approximately 0.25 lbs from the harvested biomass, and determine the weight of the subsample in pounds (if the weight of the total sample is 0.25 lbs or less, skip the step of taking a subsample).
Blood samples were collected from a subsample of approximately 44,000 students by qualified professionals in the participating schools.
Focus groups will explore barriers and facilitators to physical activity with respect to neighbourhood built and social environment in a subsample of approximately 80 participants.
In five countries - Belgium, Greece, Hungary, Switzerland and the Netherlands - accelerometer data were collected in a subsample of approximately 200 children per country.
This study investigated a subsample of approximately 100 patients with AN and severe underweight who had been admitted to our hospital between 2000 and 2013.
40 A subsample of approximately 40 participants will be randomly selected from each school for the GPS and interactive mapping measurements.
Among a subsample of roughly half that group, 59percentt said they supported a timetable for troop withdrawal.
PA (expressed in kcal/week) was only assessed on a subsample of subjects (approximately half) using the Paffenbarger Physical Activity Questionnaire (17).
We inspected fish collections from the Chinese museums and identified a random subsample of approximately 10 specimens per species to assure correct species assignments.
Preferably we would have liked to identify a subsample of employees displaying approximately identical total sick leave lengths but having a diverse number of spells.
To calculate the incidence rate per person-years, the expected subsample of approximately 800 HCV seronegative patients (given a prevalence rate of 68%% anti-HCV seropositive patients, see ' Sample Size') will be observed over the course of 12 months.
