The phrase 'frequency by which' is correct and usable in written English.
It is used to describe the amount or rate at which something occurs. For example: The frequency by which the train runs has increased since the introduction of the new schedule.
Therefore, increasing milking frequency during early lactation increases the frequency by which these hormones are released, signaling a higher demand for milk.
The goal of the study was to increase the frequency by which medical staff washed their hands, as sanitization in medical settings is extremely important for preventing the spread of disease.
To determine the frequency by which non-injured regenerating rays would be located next to other regenerating rays if spontaneously regenerating rays were randomly distributed, we performed a Monte Carlo simulation64.
By inducing SCRaMbLE in heterozygous diploids that contain a wild-type counterpart to each synthetic chromosome, we reduce the frequency by which a deleterious SCRaMbLE event, i.e., deletion of an essential gene, is fatal to the cell in which it occurs.
Vertical mixing is an important criteria influencing the algal growth compared to axial mixing as it determines the frequency by which cell will travel from bottom (dark zone) to surface (light zone) of the open pond.
By taking advantage of the signature frequency by which organic and inorganic molecules absorb light, the team of researchers, led by Luke Lee, professor of bioengineering and director of Berkeley's Biomolecular Nanotechnology Center, can determine in real time whether specific enzymes are activated or particular genes are expressed, all with unprecedented resolution within a single living cell.
Frequencies by which physicians prescribe the abovementioned tests for screening purposes are reported in Table 1.
To measure completeness, the frequencies by which complete intervention, population and outcome information are reported in abstracts were measured.
First, on a group level, frequencies by which items were chosen as key factor by case managers and clients were compared and tested with a Spearman rank correlation.
Secondly, we registered the various combinations and frequencies by which these words appeared in title, abstract and MeSH as well as how closely they were located together.
Table 1 presents the rank ordered frequencies by which clients and case managers selected the START items as critical vulnerability or key strength of the client on their first assessment per client.
