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501_Lecture_01-1

501_Lecture_01-1 - Stat 501 Experimental Statistics I...

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Stat 501 Experimental Statistics I
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Handouts Print off the following: Syllabus Schedule As we go along: Posted lectures Homeworks Other handouts and review topics
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About SAS Read the Introduction to SAS handout if desired. intro.sas is the file with the code. Copies of SAS to install on your home computer available in STEW G65, there phone is 494-5100. SAS is available online at www.itap.purdue.edu/learning/ Software remote E-mail me for SAS coding questions: [email protected] Include relevant SAS code in the body of the email, attachments don t always work. Usually the Stat department provides SAS help sessions *Wednesdays 7-9pm in SC289. *-Subject to change from semester to semester
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Data, Data, Data, all around us ! We use data to answer research questions What evidence does data provide? Example 1: How do I make sense of these numbers without some meaningful summary? Subjec t SBP HR BG Age Weight Treatment 1 120 84 100 45 140 1 2 160 75 233 52 160 1 3 95 63 92 44 110 2 . . . . . . .
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Example 2 Study to assess the effect of exercise on cholesterol levels. One group exercises and other does not. Is cholesterol reduced in exercise group? people have naturally different levels respond differently to same amount of exercise (e.g. genetics) may vary in adherence to exercise regimen diet may have an effect exercise may affect other factors (e.g. appetite, energy, schedule)
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What is statistics?
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