September 23 Lecture

September 23 Lecture - Lecture September 23, 2011 Graphical...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture September 23, 2011
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Graphical Techniques In addition to numeric techniques, we have graphical techniques that can be used to analyze data. These graphical techniques include line plots, boxplots, dot plots, histograms, stem and leaf plots, etc…
Background image of page 2
Dotplots Each data value is plotted and replaced by a point. Hence the dataset 1,2,3 would look like: 1 2 3
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Dotplots with Repeats For a single set of data we may be interested in the repeats. In such a case we may draw a dot for every repeat. Eg. 1,1,2,3 1 2 3
Background image of page 4
Example Dataset Consider the following data: 1,2,2,3,3,3,4,4,4,4,5,5,5,6,6,7 Go ahead and construct a dot plot (next slide).
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1,2,2,3,3,3,4,4,4,4,5,5,5,6,6,7
Background image of page 6
Boxplots
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Unmodified Boxplot Min Q1 Q2 Q3 Max IQR=Q3-Q1 Range = Max - Min
Background image of page 8
Recall: Outliers Outliers : Data values that are more extreme (larger or smaller) than the others. Ex: 1,1,2,2,3,3,4,4,5,5,6,6,25 • Is there an algorithm / formula that can be used to identify suspected outliers? •Y e s ! !
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What is an outlier mathematically? Obviously from the data above the number 25 is suspect.
Background image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/04/2011 for the course STAT 202 taught by Professor Springer during the Fall '09 term at Waterloo.

Page1 / 28

September 23 Lecture - Lecture September 23, 2011 Graphical...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online