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**"Percentile"****Related Terms:**Percentile rank, Percentiles, Normal curve equivalent, Stanine, Quantile, Standard score, Frequency distribution, Central limit theorem, Statistic, Quartile, Sampling distribution, Decile, Interquartile range, Parameter, Confidence interval, Probability sampling, Population, Confidence limits, Estimate, Random sample, Central tendency, Distribution, Inferential statistics, Simple random sampling, Random sampling, Probability sample, Confidence intervals, Descriptive statistics, T-test, Normal distribution, Outlier, Estimator, Deviation, Chi-square test, Sampling error, Sample, Simple random sample, Random selection, Degrees of freedom, Quota sample, Biased sample, Sample, Statistical inference, Stratified sample, Quota sampling, Score, Average, Stratified sampling, Point estimate

Score value for a specified percentage of cases in a distribution of scores

Percentiles are values that divide a sample of data into one hundred groups containing (as far as possible) equal numbers of observations. For example, 30% of the data values lie below the 30th percentile.

The point below which a specified percentage of the observations fall.

A one hundredth part of a set of data.

A statistical value that represents a distribution of data - in this case of ambient air concentrations. For example, the 99.9 percentile represents the ninth-highest result from a years worth of one-hour monitoring data.

A value on a scale that indicates the percent of a distribution that is equal to it or below it. For example, a score at the 95th percentile is equal to or better than 95 percent of the scores.

The set of partition values that divide the total frequency into 100 equal parts.

a position in the distribution of a variable. For example, the 20th percentile is the position where 20% of occurrences of the variable are smaller and 80% are larger.

any one of the score points dividing a score distribution into parts each of which contain 1/100 of the scores. The 75th percentile is a score that is equal to or better than 75 percent of the scores.

A number showing how many cases, out of every hundred, fall below the point (score, amount) in question.

One of the division points that divides a set of ranked data into one hundred equal points.

A point score in a distribution graph below which falls a certain number of cases. A statistical description of a score.

A 10 percentile is the value (of a particular variable such as weight) beneath which 10% of the population falls. A 50 percentile is the value beneath which 50% of the population falls. These could also be written as 10%ile and 50%ile.

the value in an ordered set of measurements such that P% of the measures lie below that value.

Statistical representation of varying levels of a particular pollutant over time. For example, the 99.9th percentile would indicate the level of that pollutant in the air that would not be exceeded by 99.9% of the readings taken during the period of measurement.

The percentage of examinees in the norm group who scored at or below the raw score for which the percentile rank was calculated.

The value in a distribution such that some percentage of scores is higher or lower than the percentage chosen. EX: To find the 15% percentile of 50 scores, arrange them in numerical order and count the bottom 7 (15% of 50). The value that is 15% of the distance between number 7 and number 8 is the 15% percentile. Percentile is sometimes written %ile, but it is not the same as percentage. [See also decile, median

the specific value of a distribution that divides the distribution such that p percent of the distribution is equal to or below that value. Example for p=95: "The 95th percentile is X" means that 95% of the values in the population (or statistical sample) are less than or equal to X.

(statistics) any of the 99 numbered points that divide an ordered set of scores into 100 parts each of which contains one-hundredth of the total

an individual score within a norm

a ranking used to provide information in the funding decisionmaking process

a statistical ranking point

a value at or below which a given percentage of the data lies

a value on a scale of one hundred that indicates the

The th percentile (of a variable) is a value such that percent of the individuals do not exceed that value, and 100- percent have at least that value. (cf. : quantile) The 25th, 50th, and 75th percentiles are generally called lower quartile, median, and upper quartile, respectively.

One of the values of a variable that divides the distribution of the variable into 100 groups having equal frequencies. In this report, the 25th and 75th percentile are used. Median also is used and is equivalent to the 50th percentile.

A value on a scale of zero to 100 that indicates the percent of a distribution that is equal to or below it. A score in the 95th percentile is a score equal to or better than 95 percent of all other scores.

A statistical graph indicating the rank of a statistic or outcome as plotted on a scale with 100 equal groups.

The percent of individuals in a population who's measurements are below that of a given measurement. For example, the child's BMI-for-age being at the 80th percentile means that 80% of children his age in the reference population have a BMI lower than his.

Used to give an observed value a ranking within the historical record. For example, only 5% of observations lie below the 5-percentile (i.e. the coldest 5% of the record) and 5% of observations lie above the 95-percentile (i.e. the warmest 5% of the record).

represents the relative position or rank of each priority score (along a 100.0 percentile band) among the scores assigned by a particular study section.

This is a way of expressing a candidate's test score. Percentile expresses the performance in terms of percentages but does not relate to the number of questions correct. Rather it describes the percentage of people that the candidate performed better than e.g. 50 percentile = better than 50% of people who took the test. 90 percentile = better than 90% of people who took the test. Percentile is written in short form as %ile.

A number based on dividing something into 100 parts—in this case, a group of children of the same age. The centile number tells what percentage of children of that age are taller or shorter than the child being measured.

See centile.

The set of numbers from 0 to 100 that divide a distribution into 100 parts of equal area, or divide a set of ranked data into 100 class intervals with each interval containing 1/100 of the observations. A particular percentile, say the 5th percentile, is a cut point with 5 percent of the observations below it and the remaining 95% of the observations above it.

A statistical term indicating the ranking of a score on a standardized test. If a student scores in the 50th percentile on a test, for example, that means that half of all persons tested scored higher than that student and half scored lower.

A score location below which a specified percentage of the population falls. For example, in 1998, the tenth percentile of fourth-grade reading scores was 167. This means that in 1998, 10 percent of fourth-graders had NAEP reading scores at or below 167, while 90 percent scored above 167.

Need to know where you rank amongst the top HSX traders? You can always check out your percentile and find out your ranking within the Exchange. The rank percentile shows roughly where your portfolio stands against other traders (someone with a 60-percent rank would be doing better than 60 percent of the traders). Percentiles are also shown in week/month/season/year-to-date standings.

The numerical value representing the share of the observations below that value. For example, the 10th percentile for the return on assets is the point below which exactly 10 per cent of the companies with the lowest returns on assets lie.

A descriptive measure used to characterize a set of numbers. For example, if the 10th percentile of a set of 100 numbers has the value 27, then 10 percent of the numbers (10 numbers) are less than 27; the median of the set is the 50th percentile

A statistical term indicating the ranking of a score on a standardized test. If a student scores in the 99th percentile on a test, for example, that means that of all persons tested, only one percent scored higher.

A percentile rank is the percentage of scores that fall below a given score. For example, a raw score of 75 on a test might be transformed into a percentile rank of 98 and interpreted as "You did better than 98% of the students who took this test."

A value representing the percentage of people at or below a certain measurement. For example, an adult of 5th percentile stature is as tall or taller than five per cent of the general adult population. Percentile values can also be applied to non-physical dimensions, eg intelligence.

the score at or below which a particular percentage of scores fall. (649)

One of the 99 point scores that divide a ranked distribution into groups, each of which contains 1/100 of the scores. The 73rd percentile denotes the score or point below which 73 percent of the scores fall in a particular distribution of scores. (See also the table under "stanine.")

In these guidelines, usually refers to flow duration curves. The horizontal scale of the graph is divided from 0 to 100 percentiles (or per cent of time), while the vertical scale is flow rate (often in ML/day). For example, when looking at flow rates, the 90th percentile is the daily rate that is exceeded on 90% of days at a specific location. If the 90th percentile is 13 ML/day, then the stream flow would be higher than 13 ML/day for 329 days per year, and lower for 36 days per year.

The term for denoting thresholds or boundary values in frequency distributions. Thus the 5th percentile is that value which marks off the lowest 5 per cent of the observations from the rest, the 50th percentile is the same as the median, and the 95th percentile exceeds all but 5 per cent of the values. When percentiles are estimated by ranking the items of a finite sample, the percentile generally falls between two of the observed values, and the midway value is often taken. (From Bureau of Meteorology glossary)

A number that indicates the percentage of a distribution that is less than or equal to that number.

and percentage: "Percentage" is about the number of questions answered correctly; "percentile" is about ranking a student in comparison to other students in the same grade or age group. For example, if a student answered 8 out of 10 ten questions correctly, then the student's percentage would be 80%. If that same student's percentile score is at the 70% percentile, that student scored higher than 70% of the students who took the test.

the number in a frequency distribution below which a certain percentage of fees will fall. For example, the 90th percentile is the number that divides the distribution of fees into the lower 90% and the upper 10%, or that fee level at which 90% of dentists charge that amount or less, and 10% charge more.

A percentile is useful to know how a student performed in comparison to other students. National Percentile Rank (NPR) represents the rank of an individual student as compared to those students in the norm group. For example if a student's NPR is 69, this indicates that this student scored as well or better than 69 % of the students who took the test. Conversely, it indicates that 31% of the students scored as well or better than this student. Percentiles cannot be averaged, as they are rankings.

A type of quantile.

A statistical measure representing the ranking of a particular figure or outcome on a scale comprising 100 equal groups. See also Quartile.

This type of score indicates the percentage of pupils in an age group who have obtained scores below a particular score. For example, a pupil with a percentile rank of 70 has a score which was as good as or better than 70 per cent of the normative sample for his or her age group. Note that a pupilâ€™s percentile on an assessment should not be confused with the term â€˜percentage, which indicates the proportion of assessment items answered correctly.

A value in a data set that indicates a certain percentage of scores is equal to or below this value. For example, a score at the 95th percentile is equal to or better than 95 percent of the scores.

One of a set of numbers on the random-variable axis that divides a probability distribution into 100 equal areas; it is a quantile equal to one one-hundredth of a total population.

Describes relative standing within a group, in terms of rank by percentage. In other words, a percentile is a measure of position - it provides points above or below which we can find certain percentages of the total set of data. The percentile of a given data value is the percentage of records in the distribution that fall below that data value. For example, the seventy-fifth percentile of length of stay would be that length of stay which exceeds the length of stay of seventy-five percent of all patients.

A term doctors use to describe a childâ€™s height and weight, as compared to other children.

a statistical way to compare one child's weight with that of many other children

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