The phrase "an upper percentile" is correct and usable in written English.
It can be used when referring to a specific range or group that falls within the higher percentage of a distribution, often in statistics or assessments.
Example: "Students who scored in the upper percentile of the exam were recognized for their outstanding performance."
Alternatives: "a higher percentile" or "the top percentile".
In this case, "abnormal" was defined by the 5th percentile of the control distribution in the direction of adverse response (lower percentile for a decreasing adverse response, and upper percentile for increasing adverse response).
Because we have a good fit to the median and upper percentile values, we maintain the fitted curve as a reasonable prior approximation for tap water concentrations.
The lower percentile was set using the setting sheet at 5% and the upper percentile at 95%, creating a 90% prediction interval envelope.
For example, if a company's director compensation is in the upper percentile of its peer study, consider having the record reflect a brief statement of the rationale.
The median PM concentrations give an idea of the 'normal' PM concentration range and the upper percentile concentrations indicate possible overdose levels.
The EFSA Guidelines for the European Union comprehensive food consumption database have examined the reliability of upper percentile estimates and recommended that percentiles calculated over a number of subjects/days lower than 60 (for the 95th percentile) and lower than 300 (for the 99th percentile) may not be statistically robust and should be interpreted with caution (EFSA 2011a).
This specific sediment yield ranks among the top 20% globally, while the intensity-duration curve of the rainstorm is similarly in the upper percentile range of storms that had triggered landslides.
However, even at those remaining upper percentiles, the relative loss in rate is much smaller than the relative gain for the lower percentiles; at worst, the upper percentile rates drop by about 5%.
The concept and meanings of lower and upper percentile values were not consistently or easily understood by the majority of participants when reading from a hazard curve (Figure 10).
