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PDB_Stat_100_Lecture_13_Printable

# PDB_Stat_100_Lecture_13_Printable - STA 100 Lecture 13 Paul...

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STA 100 Lecture 13 Paul Baines Department of Statistics University of California, Davis February 2nd, 2011

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Admin for the Day I Please pick up Midterm+old homeworks I Homework 3 due today by 5pm! I !!!!!! PLEASE TURN IN R OUTPUT FOR HWK 3 !!!!! I Homework 4 will be posted later today, due next Wednesday I For Hwk 2 you can get back the points you lost for not turning in your R output back if. . . You print out your R output, staple it to your graded homework and bring it to me by Friday ! References for Today: Rosner, Ch 5.1-5.6 (7th Ed.) References for Friday: Rosner, Ch 5.7-5.9, Ch 6.5 (7th Ed.)
Key Ideas from Last Time 1. How to conduct a statistical analysis I Plot, Assume, Estimate, Check, Answer, Predict. 2. Motivation I Why do we care about estimating the parameters (e.g., λ )? (b/c they tell use everything we need!) I Why do we need to estimate the parameters e.g., λ ? (b/c we don’t know them!) 3. Sampling Distributions I What other values could your estimate have taken? 4. Quantifying Uncertainty in your estimates I Every estimate should come with a measure of how much (un)certainty there is in that estimate! I This will come from the sampling distribution. . .

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Continuous Data So far, we’ve talked about tools for three main data types: Type of Data Values it can take Examples Binary Two values Y/N, Male/Female, Ginger/Not, Disease/No Disease, Pregnant/Not ‘Independent 0,1,. . . ,n No. Gingers out of 20 children, Trials’ ( n =no. trials) No. heads out of 10 coin ﬂips, How many injured sloths out of 200 Count 0,1,2. . . No. cases of Lyme disease, (no upper bound) No. traﬃc accidents No. Vet Emergencies Continuous Any Height (in cm), (Decimals) Blood Pressure, Weight (in lb) Today we add a fourth. . .
Example Example: (Rosner 5.22) To diagnose a stroke a test has been developed to measure blood ﬂow in the brain. Cerebral Blood Flow (CBF) is measured in mililiters per 100g of brain tissue (lets call the units mlcg’s). If blood ﬂow in the brain is low (deﬁned as

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PDB_Stat_100_Lecture_13_Printable - STA 100 Lecture 13 Paul...

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