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Topic closed. 2 replies. Last post 10 years ago by LAVERNE MALONEY.

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September 1, 2006
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 Posted: May 6, 2007, 3:09 pm - IP Logged

Sorry if this is a stupid question, but I have seen he term "Lifetime Quartile 3" stated at least 10 different times, and I have no idea what this concept means. If anyone here has any knowledge of this and how it relates to Pick-3, could you do a "dummies" explanation of it. Any help would be appreciated. Thanks.

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June 22, 2005
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 Posted: May 6, 2007, 3:34 pm - IP Logged

In descriptive statistics, a quartile is any of the three values which divide the sorted data set into four equal parts, so that each part represents 1/4th of the sample or population.

Thus:

• first quartile (designated Q1) = lower quartile = cuts off lowest 25% of data = 25th percentile
• second quartile (designated Q2) = median = cuts data set in half = 50th percentile
• third quartile (designated Q3) = upper quartile = cuts off highest 25% of data, or lowest 75% = 75th percentile

The difference between the upper and lower quartiles is called the interquartile range.

There is no universal agreement on choosing the quartile values. One possible rule (employed by the TI-83 calculator boxplot and 1-Var Stats functions) is as follows:

1. Use the median to divide the ordered data set into two halves. Do not include the median into the halves.
2. The lower quartile value is the median of the lower half of the data. The upper quartile value is the median of the upper half of the data.

The examples below assume this rule.

Example 1
Data Set: 6, 47, 49, 15, 42, 41, 7, 39, 43, 40, 36
Ordered Data Set: 6, 7, 15, 36, 39, 40, 41, 42, 43, 47, 49

$\begin{cases} Q_1 = 15 \\ Q_2 = 40 \\ Q_3 = 43 \end{cases}$

Example 2
Ordered Data Set: 7, 15, 36, 39, 40, 41

$\begin{cases} Q_1 = 15 \\ Q_2 = 37.5 \\ Q_3 = 40 \end{cases}$

Example 3
Ordered Data Set: 1 2 3 4

$\begin{cases} Q_1 = 1.5 \\ Q_2 = 2.5 \\ Q_3 = 3.5 \end{cases}$

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August 5, 2003
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 Posted: May 6, 2007, 5:28 pm - IP Logged

Sorry if this is a stupid question, but I have seen he term "Lifetime Quartile 3" stated at least 10 different times, and I have no idea what this concept means. If anyone here has any knowledge of this and how it relates to Pick-3, could you do a "dummies" explanation of it. Any help would be appreciated. Thanks.

Here is a link to a post mentioning the topic. Perhaps the posters in this thread may be able to help you Shawn67.