The phrase "as an extraneous variable" is correct and usable in written English.
It can be used in contexts related to research, statistics, or experimental design to refer to a variable that is not of primary interest but may affect the outcome of the study.
Example: "In our analysis, we must consider the impact of temperature as an extraneous variable that could influence the results."
Alternatives: "as a confounding variable" or "as a secondary variable".
Year was used as independent variable, angle as dependent variable and judge as an extraneous variable (covariate).
With post-nonword point duration partialled out as an extraneous variable, the correlational nonword point effect for pre-nonword point duration increased to r = 0.55, P < 0.001 (Fig. 2), comparable with the behavioral results seen outside the scanner.
This is an extraneous variable which may have led variation in power profiles observed among participants which was not related to the exercise protocol.
The mothers' fear of exposing their babies to HIV virus, which emerged as an important reason for discontinuing EBF before 12 weeks postnatal, might be a possible extraneous variable that influenced the relationship between PEBB and prenatal intended duration of EBF.
Subject analyses (F1) were omitted as extraneous variables cannot be taken as covariates.
Any duration differences among these conditions were treated as extraneous variables in the imaging analyses.
Sequence duration variations across items, including pre- and post-nonword point durations, were partialled out as extraneous variables, since they were not matched across conditions.
If so, report it as an Extraneous Information defect.
If not, report it as an Extraneous Information defect.
The reported odds ratio was unusually high for this type of study, 5.5 (95% CI 1.9 15.8), even after adjusting for a number of relevant extraneous variables [ 59].
It should be noted that the mean pregnancy rate used here is only a rough guide to the fertility of the ejaculates since it does not take into account such extraneous variables as female factors and inseminator differences.
