Class_5

Class_5 - Crosstabulation Crosstabulation Describing...

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Unformatted text preview: Crosstabulation Crosstabulation Describing Association To what extent are two variables, X and Y , related? We begin with the concept of statistical independence Room Temperature Mean Exam Score 72 75 72 98 72 85 Room Temperature Mean Exam Score 72 75 85 70 98 65 An ideal measure of association would have a value of 0.0 when there is no association and a value of 1.0 when there is perfect ( direct or inverse ) association. |||-1.0 0.0 + 1.0 Unfortunately, x 2 doesnt have this property. Instead, it varies as follows: | 0.0 + Twenty high school seniors on a survey were asked two questions: (1) whether they were male or female; and (2) whether they planned to attend a four-year college immediately upon graduation. The separate answers were: Male = 11, Female = 9 Yes = 6, No = 14 Observed Frequencies Gender Male Female Total College Yes 4 2 6 Plans No 7 7 14 Total 11 9 20 Expected Frequencies Gender Male Female Total College Yes 3.3 2.7 6 Plans No 7.7 6.3 14 Total 11 9 20 Generalizing this approach, the algorithm is: Here, " f-hat" means expected frequency, and f i....
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This note was uploaded on 02/04/2008 for the course PPD 404 taught by Professor Velez during the Fall '07 term at USC.

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Class_5 - Crosstabulation Crosstabulation Describing...

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