Dr. Kusman Sadik, M.Si
Sekolah Pascasarjana Departemen Statistika IPB
Semester Ganjil 2019/2020
Analisis Statistika (STK511)
IPB University─ Bogor Indonesia ─ Inspiring Innovation with Integrity
Statistika Deskriptif
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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(1) 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).
(2) 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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Artinya, paling sedikit 70 persen dari mahasiswa
peserta STK511 tersebut nilai ujiannya lebih kecil
atau sama dengan 80.5.
Berarti juga paling sedikit 30 persen dari mahasiswa
peserta STK511 tersebut nilai ujiannya lebih besar
atau sama dengan 80.5.
Misalnya diketahui persentil ke-70 dari nilai ujian
STK511 mahasiswa baru IPB adalah 80.5. Jelaskan
artinya !
Lihat Johnson , hlm. 40-4528
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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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Menu Graph untuk Tabel dan Grafik
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Menu Stat untuk Statistika Deskriptif
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Menu Stat untuk Statistika Deskriptif
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Johnson (Exercise : 2.1), hlm. 36
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Johnson (Exercise : 2.17), hlm. 38
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Kerjakan soal ini
melalui software
MINITAB
Johnson (Exercise : 2.22), hlm. 39
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Kerjakan soal ini
melalui software
MINITAB
Johnson (Exercise : 2.61), hlm. 57
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Kerjakan soal ini secara manual, kemudian dikerjakan pula
melalui software MINITAB. Bandingkan hasil manual dengan
output MINITAB.
Johnson (Exercise : 2.67), hlm. 57
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Kerjakan soal ini
melalui software
MINITAB
Johnson (Exercise : 2.84), 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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kusmansadik.wordpress.com
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