Reference no: EM131093819
Cement composition. Data on the effect of composition of cement on-heat evolved during hardening are given below. The variables collected were the amount of tricalcium aluminate (X I), the amount of tricalcium silicate (X2), the amount of tetracalcium alumino ferrite (X3), the amount of dicalcium silicate (X4), and the heat evolved in calories per gram of cement (Y).
a. Fit regression model (6.5) for four predictor variables to the data. State the estimated regression function.
b. Obtain the estimated ridge standardized regression coefficients, variance inflation factors, and R2 for the following biasing constants: c = .000, .002, .004, .006, .008, .02, .04, .06, .08, .10.
c. Make a ridge trace plot for the biasing constants listed in part (b). Do the ridge regression coefficients exhibit substantial changes near c = O?
d. Suggest a reasonable value for the biasing constant c based on the ridge trace, VIF values, and R2 values.
e. Transform the estimated standardized ridge regression coefficients selected in part (d) to the original variables and obtain the fitted values for the 13 cases. How similar are these fitted values to those obtained with the ordinary least squares fit ill part (a)?
|
Second-order regression model
: a. Fit regression model (8.2). Plot the fitted regression function and the data. Does the quadratic regression function appear to be a good fit here?
|
|
The basis of the weighted least squares fit
: a. On the basis of the weighted least squares fit in Problem II. 7e, construct an approximate 90 percent confidence interval for ß1 by means of (6.50), using the estimated standard deviation s{bn-1}.
|
|
Refer to computer-assisted learning
: a. Based on the weighted least squares fit in Problem 11.6e, construct an approximate 95 percent confidence interval for ß1 by means of (6.50), using the estimated standard deviation s{bn-1}
|
|
Describe the negligence law and explain its economic logic
: Economics 236: Health Economics and Policy Group Assignment 6. Describe the Negligence Law and explain its economic logic. What is the "Hand Rule"
|
|
Effect of composition of cement on-heat evolved
: b. Obtain the estimated ridge standardized regression coefficients, variance inflation factors, and R2 for the following biasing constants: c = .000, .002, .004, .006, .008, .02, .04, .06, .08, .10.
|
|
Describe basic structure by which medicare reimburses care
: Economics 236: Health Economics and Policy - Group Assignment 5. Describe the basic structure by which Medicare reimburses care. Discuss the Catastrophic Protection Act of 1988
|
|
Find the sample variance
: On opening day one season, 10 major league baseball games were played and they lasted the following numbers of minutes. 167 211 187 176 170 169 198 218 145 232, Find the sample variance. Round your answer to two decimal places.
|
|
The estimated ridge standardized regression coefficients
: a. Obtain the estimated ridge standardized regression coefficients, variance inflation factors, and R2 for the following biasing constants: c = .000, .005, .01, .02, .03, .04, .05.
|
|
Preferred american-branded hotels
: Hotels.com would like to test the hypothesis that the proportion of American travelers in Europe that prefer an American-branded hotel equals 0.42. A random sample of 90 Americans found that 49 preferred American-branded hotels. Hotels.com would l..
|