period, time, errors, plan, technique, method, techniques, error, procedure, plans, methods, theory, procedures, model, study, rate, studies, approach, devices, tube, device, process, data, interval, program, frequency, date, point, design, basis, observations, equipment, scheme, valve, analysis, bottles, models, apparatus, systems, distribution, based, points, strategy, problem, rates, schemes, filter, algorithm, unit, units, instruments, strategies, frame, instrument, operation, tubes, methodology, bottle, factor, bias, designs, stations, tables, replacement, inspection, occasion, variability, survey, tests, schedules, filters, task, assumption, periods, intervals, recording, mission, probe, ratio, bulb, observation, measurements, network, train, rod, estimating, exposure

random, stratified, systematic, simple, representative, small, statistical, fetal, adequate, theoretical, purposive, sequential, double, stage, continuous, extensive, direct, selective, frequent, chorionic, spatial, limited, fair, inadequate, periodic, venous, endometrial, multiple, adaptive, arterial, nonprobability, uniform, brief, environmental, careful, wide, broad, umbilical, proper, intensive, routine, percutaneous, quantitative, regular, sub, cluster, generous, accurate, discrete, scientific, based, proportional, repeated, digital, isokinetic, independent, disproportionate, simultaneous, time, detailed, serial, interval, multistage, destructive, purposeful, event, temporal, stochastic, petrosal, adrenal, biological, blood, over, proportionate, thorough, correct, intermittent, composite, automatic, efficient, incomplete, preliminary