by frequency vs by frequencies

Both 'by frequency' and 'by frequencies' are correct, but they are used in different contexts. 'By frequency' is used when referring to the rate at which something occurs, while 'by frequencies' is used when referring to a set of different rates or occurrences.

Last updated: March 22, 2024 • 816 views

by frequency

This phrase is correct and commonly used in English.

This phrase is used when referring to the rate at which something occurs or the number of times something happens.

Examples:

The data is sorted by frequency of occurrence.
Words are ranked by frequency in the English language.
The analysis is done by frequency of response.

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Highlight calls by frequency over the past 24 hours.
Reported adverse events are listed below, by system organ class and by frequency.
Adverse reactions reported in a clinical trial following primary vaccination with Fendrix and considered as being at least possibly related to vaccination have been categorised by frequency.
Adverse reactions reported in a clinical trial following primary vaccination with Fendrix and considered as being related or possibly related to vaccination have been categorised by frequency.
The adverse reactions are listed below, by system organ class and by frequency.
Table 4 lists the adverse reactions recorded in clinical studies in the total safety population treated with Xolair by system organ class and by frequency.
Table 4 lists the adverse reactions recorded in clinical studies in the total safety population treated with Xolair by system organ class and by frequency.
Reported adverse reactions are listed below, by system organ class and by frequency.
Reported adverse reactions are listed below, by system organ class and by frequency.
Adverse reactions are listed by system organ class and ranked by frequency in Table 1, reflecting data from the following sources:
4.8 Undesirable effects Adverse reactions are listed by system organ class and ranked by frequency in Table 1, reflecting data from the following sources:
These reactions are presented by system organ class and by frequency.
Table 2 presents adverse reactions by system organ class and by frequency category.
Adverse drug reactions due to Doribax 500 mg are listed below by frequency category.
2 all adverse reactions have been ranked by frequency within each system organ class.
Table 3 presents adverse reactions by system organ class and by frequency category.
Local and general adverse reactions reported following primary vaccination with Ambirix were categorised by frequency.
Adverse reactions in the three phase III studies are listed in table 1 below by system organ class (in MedDRA) and by frequency.
Adverse reactions considered as being at least possibly related to vaccination have been categorised by frequency as follows.
Adverse events (Preferred Terms) in the overall population studied clinically with Raptiva are listed below by frequency of occurrence and by MedDRA System Organ Class.

Alternatives:

according to how often
based on how frequently
by the rate of occurrence
by the number of times

by frequencies

This phrase is correct but less commonly used in English.

This phrase is used when referring to a set of different rates or occurrences, each with its own frequency.