The phrase "and by counting the number of" is correct and usable in written English.
You can use it when explaining a method of quantifying or measuring something through counting.
Example: "The results were analyzed and by counting the number of responses, we were able to determine the overall satisfaction level."
Alternatives: "and by tallying the number of" or "and by measuring the count of".
Data from each modality is transformed to discrete time count data by using an artificial neural network to obtain counts of objects in CCTV images and by counting the number of tweets or Instagram posts in a geographical area.
The severity of the herpes virus-induced corneal disease, assessed by biomicroscopic examination and by counting the number of corneal lesions as well as by determining the virus titers, was significantly less in vitamin A deficient animals than in controls.
This can be done by putting her on, say, the Stephansplatz, a popular place in the old town of Vienna, and by counting the number of people passing by and telling her that Vienna is the capital of Austria.
Then we analyzed all the imaging data by measuring the mean intensity of nuclear pMAPK relative to calyx (the dendritic area of MB) and by counting the number of nuclei with strong pMAPK signal in different types of KCs.
A c-Fos positive cell density map was prepared for each section by automatically detecting c-Fos positive cells and by counting the number of immunostained cells at each 100 µm×100 µm square compartment.
At the final (day 9) home visit, the study nurse collected the symptom diaries and evaluated adherence to interventions by interview and by counting the number of surgical masks remaining or weighing the amount of soap and alcohol left in bottles and dispensers.
H. robusta damage was assessed by counting the numbers of shoots attacked, branches, and dead shoots.
Tumor-induced angiogenesis in the skin was evaluated by counting the numbers of neovessels microscopically.
This is done by counting the number of pods per plant and beans per plot.
Then he assessed the quality of the research by counting the number of subsequent citations.
We calculated the targeting efficiency by counting the number of aggregation-deficient clones.
