Question

In: Statistics and Probability

DATAfile: CorporateBonds Company Ticker Years Yield GE 1 0.767 MS 1 1.816 WFC 1.25 0.797 TOTAL...

DATAfile: CorporateBonds

Company Ticker Years Yield
GE 1 0.767
MS 1 1.816
WFC 1.25 0.797
TOTAL 1.75 1.378
TOTAL 3.25 1.748
GS 3.75 3.558
MS 4 4.413
JPM 4.25 2.31
C 4.75 3.332
RABOBK 4.75 2.805
TOTAL 5 2.069
MS 5 4.739
AXP 5 2.181
MTNA 5 4.366
BAC 5 3.699
VOD 5 1.855
SHBASS 5 2.861
AIG 5 3.452
HCN 7 4.184
MS 9.25 5.798
GS 9.25 5.365
GE 9.5 3.778
GS 9.75 5.367
C 9.75 4.414
BAC 9.75 4.949
RABOBK 9.75 4.203
WFC 10 3.682
TOTAL 10 3.27
MTNA 10 6.046
LNC 10 4.163
FCX 10 4.03
NEM 10 3.866
PAA 10.25 3.856
HSBC 12 4.079
GS 25.5 6.913
C 25.75 8.204
GE 26 5.13
GE 26.75 5.138
T 28.5 4.93
BAC 29.75 5.903

A statistical program is recommended.

A sample containing years to maturity and yield (%) for 40 corporate bonds is contained in the data file named CorporateBonds.†

(a) Develop a scatter diagram of the data using x = years to maturity as the independent variable.

Does a simple linear regression model appear to be appropriate?

Given the upward trend of the data on the left side of the plot, a linear regression model would predict higher values for the data on the right side of the plot. So, a curvilinear regression model appears to be more appropriate.Since the data on the left and right sides of the plot both trend downward at about the same rate, a linear model is appropriate.    Given the downward trend of the data on the left side of the plot, a linear regression model would predict lower values for the data on the right side of the plot. So, a curvilinear regression model appears to be more appropriate.Since the data on the left and right sides of the plot both trend upward at about the same rate, a linear model is appropriate.

(b) Develop an estimated regression equation with x = years to maturity and x2 as the independent variables. (Round your numerical values to two decimal places.)

ŷ =

Solutions

Expert Solution

Regression Analysis
0.668
Adjusted R² 0.650
R   0.817
Std. Error   0.958
n   40
k   2
Dep. Var. Yield,y
ANOVA table
Source SS   df   MS F p-value
Regression 68.3011 2   34.1506 37.19 1.40E-09
Residual 33.9750 37   0.9182
Total 102.2761 39  
Regression output confidence interval
variables coefficients std. error    t (df=37) p-value 95% lower 95% upper
Intercept 1.02
Years,x 0.46 0.0814 5.662 1.80E-06 0.2958 0.6255
x^2 -0.01 0.0026 -3.964 .0003 -0.0155 -0.0050

a)Given the upward trend of the data on the left side of the plot, a linear regression model would predict higher values for the data on the right side of the plot. So, a curvilinear regression model appears to be more appropriate

b)

ŷ = 1.02+0.46*x-0.01*x2


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