Lect23 - Leveraged Outliers Dependent Errors and Time...

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Unformatted text preview: Leveraged Outliers Dependent Errors and Time Series Outline Leveraged Outliers Dependent Errors and Time Series 1 / 15 ISOM 2500 Lect 23: Leveraged Outliers; Dependent Errors and Time Series Leveraged Outliers Dependent Errors and Time Series How Much to Bid? • A contractor is bidding on a project to construct an 875 square-foot addition to a home. • If he bids too low, he loses money on the project. • If he bids too high, he does not get the job. • The contractor has kept data that record the costs for 30 similar project: • All but one of his previous projects are smaller than 875 square feet. • His one project at 900 square feet is an outlier. 2 / 15 ISOM 2500 Lect 23: Leveraged Outliers; Dependent Errors and Time Series Leveraged Outliers Dependent Errors and Time Series Keep or Remove the Outlier? • If keep the outlier, then the fitted equation is Estimated Cost ($) = 5887 . 74 + 27 . 44 * Size (sq.ft.) • If remove the outlier, then the fitted equation becomes Estimated Cost ($) = 1558 . 17 + 44 . 74 * Size (sq.ft.) 3 / 15 ISOM 2500 Lect 23: Leveraged Outliers; Dependent Errors and Time Series Leveraged Outliers Dependent Errors and Time Series Leveraged Observations • Say that an observation is leveraged in regression if it has a small or large value of the explanatory variable. • The 900 square feet outlier is a leveraged observation as it has a large value of the explanatory variable (actually much larger than the remaining) • A leveraged observation has the ability to pull the regression line in its direction, like in the bid case 4 / 15 ISOM 2500 Lect 23: Leveraged Outliers; Dependent Errors and Time Series Leveraged Outliers...
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This note was uploaded on 12/20/2011 for the course ACCT/MGMT 2010 taught by Professor A during the Spring '11 term at HKUST.

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Lect23 - Leveraged Outliers Dependent Errors and Time...

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