Lecture 1 - Lecture 1 Data Quantitative(Numerical Variables...

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Lecture 1
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Data Quantitative (Numerical) Variables Qualitative (Categorical)
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Pictorial Presentations Categorical Variables Pie Chart Bar Chart Quantitative Variables Histogram Stem plot Time plot
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Categorical Variable Bakersfield Population Demographic ( http://profiles.nationalrelocation.com/California/Bakersfield/ ) Race Populatio n Percentag e White 161,898 47.78 Hispanic 80,170 23.66 African American 24,636 7.27 Asian 13,083 3.86 American Indian/Alaskan Native 6,235 1.84 Hawaiian/Pacific Islander 650 0.19 Other 52,177 15.40 Total 338,849 100.00
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Bar Chart
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Pie Chart
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Quantitative variables Age data from a group of patient in an ER of certain hospital on an observed night. patient id Age 1 26 2 31 3 35 4 46 5 47 6 49 7 53 8 55 9 61 10 73
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Histogram Age group Frequenc y 20 – 30 1 30 – 40 2 40 – 50 3 50 – 60 2 60 – 70 1 70 – 80 1 First form continuous groups of the variable. Then construct the frequency distribution.
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Patient Age Distribution 20 30 40 50 60 70 80 Age Group
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Quantitative Data Age distribution of 11 patients Stem Plot patient id Age 1 26 2 31 3 35 4 46 5 47 6 49 7 53 8 55 9 61 10 73 2
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