The phrase "a three step sampling" is correct and usable in written English.
It can be used when describing a sampling method that involves three distinct steps or phases.
Example: "In our research, we employed a three step sampling approach to ensure a representative selection of participants."
Alternatives: "a three-phase sampling" or "a tri-step sampling".
Geomorphometric analysis commonly entails five steps: Sampling a surface, generating and correcting a surface model, calculating land-surface parameters or objects, and applying the results.
Conventional A/D converters consist of two steps: sampling operation followed by digital quantization.
The analysis stage corresponds to the analysis of capacitive discharge current at the DC/DC converter and is composed of the following four steps: sampling, decomposition, and analysis (reducing and identifying parts).
Again, this approach required two steps: sampling from the transmission model, then sampling from the observational model.
Bayesian Markov chain Monte Carlo analysis was run for 200 million steps, sampled every 10,000 steps and the first 10% of which were removed as burn-in.
A four step multistage sampling technique was used.
Calculating the difference in protein abundance between two samples was a three step process.
The overall ITP GE procedure involves only three steps: sample loading, ITP preconcentration and GE separation and was controlled by a simple and compact negative pressure sampling device, which is composed of a vacuum vessel, a three-way electromagnetic valve and a single high voltage power supply.
On empirical data, our rate estimation requires a two steps analysis: 1) sampling a posterior distribution of dated phylogenies using a Bayesian molecular clock approach, and 2) estimating posterior diversification rates on these trees.
We created models by using a two step process to maximise sample size and power while restricting variables included at each stage of the analysis.
