percentile
Học thuậtThân thiện
Definition
Noun: A percentile is a statistical measure that indicates the value below which a given percentage of observations in a group of observations falls. It is one of the 99 points that divide a ranked data set into 100 equal parts.
Usage and Examples
A percentile is used to compare an individual score or value to a larger sample. For example, if a score is at the 90th percentile, it means it is higher than 90% of the scores in the data set.
Advanced Usage
- Percentile Rank: This refers to the percentage of scores in a distribution that a specific score is greater than or equal to. It is the inverse of finding a percentile value.
- A percentile rank of 85 means that 85% of the scores are at or below that point.
- Percentile Point/Value: The actual data value that corresponds to a specific percentile.
- The 50th percentile point is also known as the median.
Variants and Related Words
- Median (n): The 50th percentile; the middle value in an ordered data set.
- Quartile (n): The points that divide the data into four equal parts (the 25th, 50th, and 75th percentiles).
- Decile (n): The points that divide the data into ten equal parts (the 10th, 20th, 30th... percentiles).
Synonyms
- Centile: A direct synonym for percentile.
- Quantile: A broader term for values that divide a frequency distribution into equal groups (percentiles, quartiles, and deciles are all types of quantiles).
Related Phrases and Concepts
- Percentile Range: The difference between two specified percentiles (e.g., the interquartile range is the range between the 25th and 75th percentiles).
- To fall into the [X]th percentile: A common phrase describing a data point's position.
- His income falls into the top tenth percentile.
Noun
- (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