post hoc difference

USAGE SUMMARY

The phrase "post hoc difference" is not standard in written English and may cause confusion.
It could be used in contexts discussing statistical analysis or logical reasoning, particularly when referring to differences observed after a certain event. Example: "The study revealed a post hoc difference in the results, suggesting that the treatment had a significant effect."

Science

Human-verified examples from authoritative sources

Exact Expressions

2 human-written examples

12 14 The UPDRS score did not differ between the three patient groups (factorial ANOVA; no effect of group, no post hoc difference on Bonferroni-corrected t tests); in addition, all four groups did not differ with regard to age.

BMJ Open

* Significant post hoc difference.

Critical Care

Human-verified similar examples from authoritative sources

Similar Expressions

58 human-written examples

e Stride length was generally decreased (significant main effect for factor treatment but no significant post hoc differences).

EJNMMI Research

Pairwise post hoc differences were tested using this program.

AoB PLANTS

Multiple post hoc differences were assessed by means of Tukey's tests.

BMJ Open

Post hoc differences between conditions that are significant at p < 0.017 are shown with brackets and asterisks.

eLife

Tukey-Kramer adjusted P values were used to determine where the post hoc differences occurred within statistically significant interaction or main effects, with significance set at P < 0.05.

American Journal of Clinical Nutrition

Among those outcomes for which clear differences are apparent, the picture is far from consistent both in terms of the magnitude of the effects and also in terms of the individual post hoc differences.

European Child and Adolescent Psychiatry

Paired t-tests were applied to analyze post hoc differences at single time points once ANOVA indicated significant effects, to assess results of in vitro experiments, and to analyze differences in sleep parameters and blood pressure.

European Journal of Immunology

Conversely, despite a trend for an increase in heart rate at the 2.5 km·h−1 trials compared to the 4 (P = 0.055) and 5.5 (P = 0.077) km·h−1 trials, no post hoc differences were observed.

BioMed Research International

Performance recovered to pre-injection levels within 48 hr (Figure 1d, post-hoc difference to baseline: p = 1.00; overall effect of time F 6,30) = 3.44, p = 0.011, power 0.88).

Plosone

Expert writing Tips

Best practice

When using "post hoc difference", ensure that the context clearly establishes the event or comparison point after which the difference is being assessed. Clarify the groups or conditions being compared to avoid ambiguity.

Common error

Avoid implying that the event caused the difference simply because it was observed afterward. "Post hoc" only describes the timing of the observation, not the underlying cause. Correlation does not equal causation.

Linguistic Context

The phrase "post hoc difference" functions as a noun phrase, typically used within statistical or research contexts. It denotes a difference that is examined or identified after a primary analysis or event. Ludwig AI indicates that the phrase may not be standard English, requiring careful contextualization for clarity.

Expression frequency: Uncommon

Frequent in

Science

100%

Less common in

News & Media

0%

Formal & Business

0%

Academia

0%

Ludwig's WRAP-UP

In summary, "post hoc difference" is a phrase primarily used in scientific and statistical contexts to denote a difference that is observed or analyzed after a primary analysis or event. While grammatically acceptable, it is not considered standard English and may cause confusion, as noted by Ludwig. Therefore, when using this phrase, clarity is essential. Alternative phrases like "subsequent difference" or "difference observed afterwards" may enhance understanding for a broader audience. The phrase's purpose is to specify the timing of the difference being observed, rather than indicating causality. It appears mostly in formal and scientific registers, with the analyzed examples coming from journals. Given the potential for misinterpretation, careful contextualization is crucial.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

subsequent difference

This phrase replaces "post hoc" with "subsequent", focusing on the timing of the difference being observed after a specific event.

difference observed afterwards

This alternative uses more common language to convey that the difference was noted following a particular event or treatment.

difference found after the fact

Emphasizes that the difference was identified retrospectively, after the event or experiment was completed.

difference detected post-intervention

This is more specific to experimental contexts, indicating a difference that arose after an intervention or treatment was applied.

retrospective difference

This phrase highlights the retrospective nature of identifying the difference.

difference emerging subsequently

Similar to "subsequent difference" but uses "emerging" to suggest the difference became apparent over time following the event.

outcome difference

Focuses on the difference in results or outcomes following a specific event.

disparity noted after treatment

Highlights a clear distinction or inequality observed following a treatment or intervention.

difference identified in follow-up

Indicates that the difference was found during a follow-up assessment or analysis.

late-emerging difference

Suggests that the difference took some time to manifest after the initial event or intervention.

FAQs

What does "post hoc difference" mean in statistical analysis?

In statistical analysis, "post hoc difference" refers to a difference that is observed or analyzed after a statistical test, such as ANOVA, has revealed a significant overall effect. "Post hoc tests" are then used to determine which specific groups differed significantly from each other.

How can I rephrase "post hoc difference" to improve clarity?

To improve clarity, you can rephrase "post hoc difference" as "subsequent difference", "difference observed afterwards", or "difference found after the fact". Choose the phrasing that best fits the context and emphasizes the timing of the observation.

Is "post hoc difference" the same as a "significant difference"?

No, "post hoc difference" simply indicates that a difference was examined after an initial analysis. A "significant difference" indicates that the observed difference is statistically unlikely to have occurred by chance, and is often determined through "post hoc analysis".

When should I use "post hoc difference" instead of "difference"?

Use "post hoc difference" when you specifically want to emphasize that the difference was identified or analyzed after a particular event, intervention, or statistical test. If the timing is not relevant, simply using "difference" may be more appropriate.