expected frequency
Low (primarily technical/academic)Formal, Technical, Academic
Definition
Meaning
The anticipated or predicted rate at which something occurs or is likely to occur.
A statistical or probabilistic measure describing how often an event is forecast to happen within a given timeframe or context, often based on historical data, theoretical models, or assumptions.
Linguistics
Semantic Notes
A compound noun typically used in technical, scientific, or planning contexts. It combines the concept of 'expectation' (a prediction) with 'frequency' (a rate of occurrence). It is often contrasted with 'observed frequency'.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or syntactic differences. Spelling conventions follow the respective norms for the component words.
Connotations
Identical technical connotations in both varieties.
Frequency
Slightly more common in American English corpora due to a higher volume of technical and business literature, but the difference is marginal.
Vocabulary
Collocations
Grammar
Valency Patterns
The expected frequency of [NOUN PHRASE] is [NUMBER/ADJECTIVE].We calculated the expected frequency for [EVENT/CATEGORY].A chi-square test compares observed and expected frequencies.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Against all expectations (related conceptually, but not a direct idiom for the term)”
Usage
Context Usage
Business
Used in risk assessment, quality control, and financial forecasting (e.g., 'The expected frequency of system downtime is once per quarter.').
Academic
Core term in statistics, epidemiology, and engineering (e.g., 'The chi-square test evaluates the discrepancy between observed and expected frequencies.').
Everyday
Rare in casual conversation. Might be used in planning discussions (e.g., 'The expected frequency of trains during rush hour is every 10 minutes.').
Technical
Fundamental in probability theory, reliability engineering, and signal processing (e.g., 'In a Poisson process, the expected frequency is denoted by lambda (λ).').
Examples
By CEFR Level
- The expected frequency of buses on this route is every 15 minutes.
- The study looked at the expected frequency of minor errors.
- Before the experiment, researchers calculated the expected frequency of each outcome.
- If the observed frequency matches the expected frequency, our model may be correct.
- The chi-square statistic is derived from the sum of the squared differences between observed and expected frequencies, divided by the expected frequencies.
- Actuarial tables provide the expected frequency of claims based on demographic data.
Learning
Memory Aids
Mnemonic
Think of a weather forecaster (expecting) counting how many times (frequency) it rains. The 'expected frequency' is their predicted count.
Conceptual Metaphor
PREDICTION IS A MAP (The expected frequency charts the territory of future events).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid calquing as 'ожидаемая частота' in non-technical contexts where 'предполагаемая частота' or 'расчётная частота' might be more natural. The English term is more tightly bound to statistical calculation.
Common Mistakes
- Using 'expectation frequency' (incorrect compound). Confusing it with 'expected value' (which is an average, not a rate). Treating it as a plural countable noun (e.g., 'expected frequencies' is correct for multiple categories).
Practice
Quiz
In a chi-square test, what does the 'expected frequency' represent?
FAQ
Frequently Asked Questions
No, they are related but distinct. Probability is a proportion (between 0 and 1), while expected frequency is a predicted count (e.g., 'We expect 20 failures' = probability of failure * number of trials).
It is quite formal. In everyday situations, phrases like 'how often we think it will happen' or 'the likely number of times' are more common.
The key antonym is 'observed frequency' or 'actual frequency,' which is the empirically measured count, as opposed to the predicted one.
In its simplest form, it is calculated as (total number of trials) * (theoretical probability of the event). In contingency tables, it's (row total * column total) / grand total.