Index of /faculty/kerns/video/STAT3743/090110

STAT 3743 Daily Outline

Up there should be four (4) files:

STAT3743_xxxxxx.3gp (video for mobile phones)
STAT3743_xxxxxx.ogv (video in Ogg format)
STAT3743_xxxxxx.pdf (scanned lecture transcript)
STAT3743_xxxxxx.webm (video in WebM format)

The WebM video is definitely the highest quality, but you need a compatible browser/player to watch it. See How to watch the video for instructions to get one.

2010-09-01 Wed

Other data types

logical
missing

Features of data distributions

Four fundamental features:

Center
Spread
Shape
Anything unusual

Symmetry versus skewness

right and left skewed

Kurtosis

leptokurtic, mesokurtic, platykurtic

Unusual features: clusters or gaps

Ex: faithful$eruptions
granularity
extreme observations
- possible sources

Descriptive statistics

Measures of center

Sample mean

advantages and disadvantages

Sample median

advantages and disadvantages

Trimmed mean

advantages and disadvantages

Order statistics

sort

Sample quantile, order p

First, third quartiles

Measures of spread

Sample variance: advantages and disadvantages

Meaning of s

Chebychev's Rule
Empirical Rule

Interquartile range (IQR)

advantages and disadvantages

Median Absolute Deviation

advantages and disadvantages

Range: disadvantages

Measures of shape

Sample skewness

Remarks
Rule of thumb

Sample excess kurtosis

Remarks
Rule of thumb

Why is it "-3"?

How to do it with R

library(e1071), skewness, kurtosis

Author: G. Jay Kerns <gkerns@ysu.edu>

Date: 2010-10-08 15:16:36 EDT

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