analisis data kategorik - · pdf file2.02.2017 · dot diagram stem-and-leaf...
TRANSCRIPT
Statistika Deskriptif
Dr. Kusman Sadik, M.Si
Departemen Statistika IPB, 2017/2018
In discussing the methods for providing summary
descriptions of data, it helps to distinguish
between the two basic types:
1. Qualitative or categorical data
2. Quantitative or numerical or
measurement data
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Discrete variable : the scale is made up of
distinct numbers with gaps in between
data count (number of bacteria, number of
ion, number of star, etc).
Continuous variable : the measurement scale
does not have gaps, such variables are called
continuous height, weight, time.
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Frequency table
Pie chart
Bar chart / histogram
Pareto chart
Lihat Johnson , hlm. 25-29
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Distribution frequency table
Histogram
Dot diagram
Stem-and-Leaf (diagram dahan-daun)
Lihat Johnson , hlm. 29-36
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The graphic procedures help us to visualize
the pattern of a data set of measurements.
To obtain a more objective summary
description and a comparison of data sets,
we must go one step further and obtain
numerical values for the location or center of
the data and the amount of variability
present.
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Rata-rata (mean)
Median
Kuartil
Persentil
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Kuartil dan Persentil
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Lihat Johnson , hlm. 40-4527
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Ragam (Variance)
Simpangan Baku (Standard Deviation)
Jangkauan (Range)
Jangkauan antar kuartil (Interquartile range)
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Lihat Johnson , hlm. 50-55
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Lihat Johnson (Example 17), hlm. 56
Min
Q1 Q2 Q3
Max
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Q1 = 4.4
Q2 = 9.4
Q3 = 17.5
(dari hasil sebelumnya)
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Apa interpretasi dari perbandingan 2 boxplot ini?
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Johnson (Exercise : 2.1), hlm. 36
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Johnson (Exercise : 2.17), hlm. 38
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Johnson (Exercise : 2.19), hlm. 38
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Johnson (Exercise : 2.22), hlm. 39
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Johnson (Exercise : 2.61), hlm. 57
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Johnson (Exercise : 2.67), hlm. 57
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Johnson (Exercise : 2.84), hlm. 59
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Johnson (Exercise : 2.89), hlm. 59
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Johnson, R.A. and Bhattacharyya, G.K. 2010.
Statistics, Principles and Methods 6th. John Wiley
& Sons, Inc., New York.
Montgomery, D.C. 2013. Design and Analysis of
Experiments 8th. John Wiley & Sons, Inc.,
Canada.
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