Definition

1. Noun:
   • (Statistics) A decile: Any one of the nine values that divide a set of ranked data into ten equal parts, each containing one-tenth (10%) of the data points. Deciles are a type of quantile used to analyze the distribution of data.

Usage

• Deciles are used to describe the spread and central tendency of a dataset, often in fields like economics, education, and social sciences.
• The first decile (D1) is the value below which 10% of the data falls. The fifth decile (D5) is the median, or the 50th percentile.
• It is typically used with ordinal or continuous numerical data.

Examples

• Noun:
  • A student scoring in the top decile of the national exam.
  • The report analyzed household income by decile.
  • The ninth decile marks the threshold for the highest 10% of earners.

Advanced Usage

• "To fall into the nth decile": To be within a specific tenth of a ranked distribution.
  • Our company's revenue growth falls into the eighth decile compared to industry peers.
• Decile rank/score: A value indicating which decile a particular data point belongs to.
  • The decile rank provides a clearer picture of performance than a simple average.

Variants and Related Words

• Quantile (n): A more general term for values that divide data into equal-sized subgroups (e.g., percentiles, quartiles, deciles).
• Percentile (n): A value below which a given percentage of observations in a group falls. A decile is equivalent to specific percentiles (e.g., the 1st decile is the 10th percentile).
• Quartile (n): Any of the three values that divide a dataset into four equal parts.

Synonyms

• Statistical point (in the context of distribution division).
• Tenth (informal, in the context of grouping, e.g., "the top tenth").

Related Phrases

• Decile analysis: The process of examining data segmented by deciles.
  • A decile analysis of customer spending revealed key patterns.
• Interdecile range: The range between the first and ninth decile, encompassing the central 80% of the data.
  • The interdecile range is less sensitive to extreme outliers than the full range.

Noun

1. (statistics) any of nine points that divided a distribution of ranked scores into equal intervals where each interval contains one-tenth of the scores