6 HP 350 Lecture Slides March 2

6 HP 350 Lecture Slides March 2 - 1 Chapter 10 HP350 Spring...

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Unformatted text preview: 1 Chapter 10 HP350 Spring 2010 2 How to Describe Data In terms of its distribution . In terms of its central tendency . In terms of its spread or dispersion . 3 Distribution of data Distribution- Describes how frequently each value is reported. - Frequency Distribution-Pie Chart-Bar graph-Stem-and-leaf chart-Percentiles 4 Visual Summaries of Data Visual figures make data easier to understand. A good visual figure is clear , precise , and efficient Clear = meaningful order, makes sense Precise = no exaggerations Efficient = no unnecessary details 5 Frequency Distribution – Nominal (Categorical) Data Useful for emphasizing the overall pattern of the data. Caselist 1st drug 108 48.6 48.6 48.6 31 14.0 14.0 62.6 45 20.3 20.3 82.9 38 17.1 17.1 100.0 222 100.0 100.0 Heroin Cocaine Meth Ketamine Total Valid Frequency Percent Valid Percent Cumulative Percent “What was the first drug you ever injected?” 6 Pie Chart Useful for describing pattern of nominal or ordinal data. C a s e lis t 1 s t d r u g 1 0 8 4 8 . 6 4 8 . 6 4 8 . 6 3 1 1 4 . 0 1 4 . 0 6 2 . 6 4 5 2 0 . 3 2 0 . 3 8 2 . 9 3 8 1 7 . 1 1 7 . 1 1 0 0 . 0 2 2 2 1 0 0 . 0 1 0 0 . 0 H e ro in C o c a in e M e t h K e t a m in e T o t a l V a lid F re q u e n c y P e rc e n t V a lid P e rc e n t C u m u la t iv e P e rc e n t Ketamine Meth Cocaine Heroin Caselist 1st drug 7 Bar Chart Useful for describing pattern of nominal or ordinal data. 8 A G E A T F I R S T I N J E C T I O N 2 . 9 . 9 . 9 3 1 . 4 1 . 4 2 . 3 5 2 . 3 2 . 3 4 . 5 5 2 . 3 2 . 3 6 . 8 1 4 6 . 3 6 . 3 1 3 . 1 2 0 9 . 0 9 . 0 2 2 . 1 3 1 1 4 . 0 1 4 . 0 3 6 . 0 4 1 1 8 . 5 1 8 . 5 5 4 . 5 2 8 1 2 . 6 1 2 . 6 6 7 . 1 2 4 1 0 . 8 1 0 . 8 7 7 . 9 1 4 6 . 3 6 . 3 8 4 . 2 1 2 5 . 4 5 . 4 8 9 . 6 6 2 . 7 2 . 7 9 2 . 3 9 4 . 1 4 . 1 9 6 . 4 7 3 . 2 3 . 2 9 9 . 5 1 . 5 . 5 1 0 0 . 0 2 2 2 1 0 0 . 0 1 0 0 . 0 8 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 5 T o t a l V a l id F r e q u e n c y P e r c e n t V a l id P e r c e n t C u m u l a t i v e P e r c e n t Frequency Distribution – Ratio (Continuous) Data “How old were you the first time you injected a drug?” 9 Histogram 10 AGE AT FIRST INJECTION Stem-and-Leaf Plot Frequency Stem & Leaf 5.00 Extremes (=<10) 5.00 11 . 00000 5.00 12 . 00000 14.00 13 . 00000000000000 20.00 14 . 00000000000000000000 31.00 15 . 0000000000000000000000000000000 41.00 16 . 00000000000000000000000000000000000000000 28.00 17 . 0000000000000000000000000000 24.00 18 . 000000000000000000000000 14.00 19 . 00000000000000 12.00 20 . 000000000000 6.00 21 . 000000 9.00 22 . 000000000 8.00 Extremes (>=23) Stem width: 1 Each leaf: 1 case(s) Stem-and-Leaf Chart 11 Money spent on illicit drugs past month 5000 4000 3000 2000 1000 Frequency 125 100 75 50 25 Histogram Mean =521.81 Std. Dev. =872.817 N =222 Money spent on illicit drugs past month 5,000 4,000 3,000 2,000 1,000 Frequency 125 100 75 50 25 Mean =521.81 Std. Dev. =872.817 N =222 Skewed Distribution (non normal)...
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6 HP 350 Lecture Slides March 2 - 1 Chapter 10 HP350 Spring...

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