Lecture4 - ECO 220Y Lecture 4 Describing Data by Graphical...

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ECO 220Y Lecture 4 Describing Data by Graphical Technique Part3 Migiwa Tanaka Reading: 2.5,2.6 1
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Outline escribing relationship between two variables Describing relationship between two variables Interval Data – Scatter Diagram i l O d i l d t C ht Nominal or Ordinal data – Bar Chart Use cross-tabulation table (Cross-classification table) 2
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Example 1: Test Score and Class Size oes reduction of class size Does reduction of class size improve elementary school ducation? DIST_COD TESTSCR STR 48 20 1 38 education? Data from 25 districts 1 648.20 21.38 80 45 8 59 DIST_CODE: district code STR: average class size 2 680.45 18.59 69 30 1 10 TESTSCR: average test score Types of Data? 3 669.30 21.10 4 50.55 16.38 How can we see the 650.55 6.38 relationship between TESTSCR & STR on a diagram? 25 663.35 20.24 3
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Scatter Diagram DIST_COD TESTSCR STR 48 20 1 38 4 26 1 648.20 21.38 80 45 8 59 22 24 2 680.45 18.59 69 30 1 10 8 20 str 3 669.30 21.10 4 50.55 16.38 16 1 650.55 6.38 620 640 660 680 700 testscr … … 25 663.35 20.24 4
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Scatter Diagram: hat does it tell us?
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This note was uploaded on 03/01/2011 for the course ECON 220 taught by Professor Tanaka during the Spring '11 term at University of Toronto- Toronto.

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Lecture4 - ECO 220Y Lecture 4 Describing Data by Graphical...

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