Cases receive the smallest huber weights

Assignment Help Basic Statistics

Reference no: EM131093902

Weight and height. The weights and heights of twenty male 'Students in a freshman class are recorded in order to see how well weight (Y, in pounds) can be predicted from height (X, in inches). The data are given below. Assume that first-order regression (I. 1) is appropriate.

a. Fit a simple linear regression model using ordinary least square and plot the data together

with the hued regression function. Also, obtain an Index plot of Cook s distance (10.33 What do these plots suggest'?

b. Obtain the scaled residuals in (11.47) and use the Huber weight function (11.44) to ohm' case weights for a first iteration of IRLS robust regression. Which cases receive the smallest Huber weights? Why'!

c. Using the weights calculated in part (b), obtain the weighted least squares estimates of the regression coefficients. How do these estimates compare to those found in part (a) using ordinary least squires'?

d. Continue the IRLS procedure for two more iterations. Which cases receive the smallest weights in the final iteration'? How do the linal IRLS robust regression estimates compare to the ordinary least squares estimates obtained in part (a)?

Reference no: EM131093902

Questions Cloud

Management of a company that develops websites : Refer to the Website developer data set in Appendix C6. Management is increased in determining what variables have the greatest impact on production output in the release of new manager, a designer and a developer are provided in the data set.

Well-formulated supply and demand curve analysis : What is learned from a well-formulated supply and demand curve analysis and how does this information help determine optimum production rates for maximum profitability?

Political and economical issues of cell phone technology : Title: The Political and Economical issues of cell phone technology in United States Political Causes/Effects

Dealing with ethical and moral issues within company : As such, you have given direction for the company in terms of its treatment of workers, diversity issues, and risk issues, and have provided consultation to other senior-level managers in dealing with ethical and moral issues within the company.

Cases receive the smallest huber weights : Weight and height. The weights and heights of twenty male 'Students in a freshman class are recorded in order to see how well weight (Y, in pounds) can be predicted from height (X, in inches). The data are given below. Assume that first-order..

Provide a brief analysis for business overall : Provide a brief yet succinct comparative analysis for a) the business overall, b) products and services, c) customers, d) goals, e) strategies, f) market positions, g) general risk factors.

Presentation for the customer : The company president tells you to prepare a PowerPoint presentation for the customer, which supports the work that is being done in Vietnam. Your task is to develop a PowerPoint presentation justifying salaries and working conditions in Vietnam ..

Biology approaches to uncover disease mechanism : Starting from the genes which encode mrna (carry the information)which in turn encode proteins (influence the amount of metabolites). Only analyzing these functions is not sufficient to determine the functionality of these molecules & their mechanism..

Concerning the introduction of strategic planning : If the owner/manager of a small company asked you for some advice concerning the introduction of strategic planning, what would you tell her?

User Account

All Pages