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The 90 th Percentile

90%. The 90 th Percentile. Florida Benchmarking Consortium October 2012 Kathy Driggers: Fire Rescue Category Lead.

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The 90 th Percentile

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  1. 90% The 90th Percentile Florida Benchmarking Consortium October 2012 Kathy Driggers: Fire Rescue Category Lead

  2. One of a set of points on a scale arrived at by dividing a group into parts in order of magnitude. For example, a score equal to or greater than 97 percent of those attained on an examination is said to be in the 97th percentile. http://www.thefreedictionary.com/percentile (Mathematics & Measurements / Statistics) one of 99 actual or notional values of a variable dividing its distributioninto 100 groups with equal frequencies; the 90th percentile is the value of a variable such that 90% of the relevant population is below that value. What is a Percentile?

  3. A Point in a Distribution

  4. NFPA Travel Standard 5.2.4.1.1 The fire department’s fire suppression resources shall be deployed to provide for the arrival of an engine company within a 240-second travel time to 90 percent of the incidents as established in Chapter 4. Many of us are accustomed to using percentages to set goals and benchmarks and to measure baselines and performance. Normally, our results would look something like this: Percentage of incidents where travel times were less than or equal to 240 seconds = 44% Why Do We Need to Know?

  5. With percentages, we see the gap between our baseline performance 44% and our benchmark goal: 90% With 90th Percentile we are looking at the gap in values: Benchmark Goal: The 90th percentile for travel for initial arriving units on all fire calls will be 4:00 minutes. Baseline Performance: The 90th percentile travel time for initial arriving units on all fire calls was 6:25 minutes. Finding the Gaps

  6. 90th percentile is the point in the distribution of performance that 90% falls below. If a fire rescue baseline performance value for travel was 6:25 minutes, that means that 90% of the times were better than 6:25. IT DOES NOT MEAN THAT 90% OF TRAVEL TIMES WERE EQUAL TO 6:25 MINUTES The challenge is to tell the rest of the story – what is happening in the distribution on each side of the 90th percentile. For example: Even though the 90th percentile is 6:25, the 50th percentile could be 2:30 minutes. What Does it Mean?

  7. If you are changing from a percentage method to a percentile method – be sure to include some information on how percentiles work and what they actually represent for your performance. Include information about the values that occur above and below your percentile benchmark. “The reader should avoid misinterpreting 90th percentile performance as meaning this is the performance that occurs 90% of the time. In fact, there is a range of times below the 90th percentile; for example, in FMZ G downtown, the 90th percentile time is 4:32, but the 50th percentile time is 2:42 meaning that half the time, travel took 2:42 or less.” Gainesville Fire Rescue Standards of Cover 2012 Tell the Rest of the Story

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