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# 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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O tli Outline Describing relationship between two variables Interval Data – Scatter Diagram N i l O di l d t B Ch t Nominal or Ordinal data – Bar Chart Use cross-tabulation table (Cross-classification table) 2
Example 1: T S d Cl Si Test Score and Class Size Does reduction of class size DIST COD TESTSCR STR improve elementary school education? DIST_COD 1 648 20 21 38 Data from 25 districts DIST CODE di i d 648.20 21.38 2 680 45 18 59 DIST_CODE: district code STR: average class size TESTSCR 680.45 18.59 3 669 30 21 10 TESTSCR: average test score Types of Data? 669.30 21.10 4 650.55 16.38 How can we see the relationship between TESTSCR & STR on a diagram? 25 663.35 20.24 3

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S tt Di Scatter Diagram DIST COD TESTSCR STR DIST_COD 1 648 20 21 38 4 26 648.20 21.38 2 680 45 18 59 22 24 680.45 18.59 3 669 30 21 10 8 20 str 669.30 21.10 4 650.55 16.38 16 1 … … 620 640 660 680 700 testscr 25 663.35 20.24 4
S tt Di Scatter Diagram: What does it tell us? Qualitative information about the relationship of two i t l i bl interval variables.

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