In: Statistics and Probability
Consider a portion of monthly return data (In %) on 20-year Treasury Bonds from 2006–2010.
| Date | Return | 
| Jan-06 | 3.13 | 
| Feb-06 | 4.15 | 
| ⋮ | ⋮ | 
| Dec-10 | 4.48 | 
Source: Federal Reserve Bank of Dallas.
Estimate a linear trend model with seasonal dummy variables to make forecasts for the first three months of 2011. (Round answers to 2 decimal places.)
| Year | Month | yˆty^t | 
| 2011 | Jan | |
| 2011 | Feb | |
| 2011 | Mar | |
DATA:
| Index | Month | Year | Return | 
| 1 | Jan | 2006 | 3.13 | 
| 2 | Feb | 2006 | 4.15 | 
| 3 | Mar | 2006 | 3.18 | 
| 4 | Apr | 2006 | 4.94 | 
| 5 | May | 2006 | 4.34 | 
| 6 | Jun | 2006 | 4.19 | 
| 7 | Jul | 2006 | 5.12 | 
| 8 | Aug | 2006 | 5.26 | 
| 9 | Sep | 2006 | 3.81 | 
| 10 | Oct | 2006 | 3.1 | 
| 11 | Nov | 2006 | 3.87 | 
| 12 | Dec | 2006 | 4.89 | 
| 13 | Jan | 2007 | 3.94 | 
| 14 | Feb | 2007 | 3.42 | 
| 15 | Mar | 2007 | 4.13 | 
| 16 | Apr | 2007 | 3.54 | 
| 17 | May | 2007 | 4.58 | 
| 18 | Jun | 2007 | 4.19 | 
| 19 | Jul | 2007 | 4.62 | 
| 20 | Aug | 2007 | 3.89 | 
| 21 | Sep | 2007 | 3.62 | 
| 22 | Oct | 2007 | 3.92 | 
| 23 | Nov | 2007 | 4.46 | 
| 24 | Dec | 2007 | 3.23 | 
| 25 | Jan | 2008 | 4.78 | 
| 26 | Feb | 2008 | 4.71 | 
| 27 | Mar | 2008 | 5.05 | 
| 28 | Apr | 2008 | 3.46 | 
| 29 | May | 2008 | 3.15 | 
| 30 | Jun | 2008 | 4.82 | 
| 31 | Jul | 2008 | 3.87 | 
| 32 | Aug | 2008 | 3.78 | 
| 33 | Sep | 2008 | 3.22 | 
| 34 | Oct | 2008 | 5.39 | 
| 35 | Nov | 2008 | 4.78 | 
| 36 | Dec | 2008 | 5.5 | 
| 37 | Jan | 2009 | 4.8 | 
| 38 | Feb | 2009 | 5.2 | 
| 39 | Mar | 2009 | 3.82 | 
| 40 | Apr | 2009 | 4.52 | 
| 41 | May | 2009 | 3.53 | 
| 42 | Jun | 2009 | 4.66 | 
| 43 | Jul | 2009 | 5.46 | 
| 44 | Aug | 2009 | 3.49 | 
| 45 | Sep | 2009 | 3.75 | 
| 46 | Oct | 2009 | 4.84 | 
| 47 | Nov | 2009 | 4.83 | 
| 48 | Dec | 2009 | 4.35 | 
| 49 | Jan | 2010 | 4.63 | 
| 50 | Feb | 2010 | 5.32 | 
| 51 | Mar | 2010 | 4.75 | 
| 52 | Apr | 2010 | 3.28 | 
| 53 | May | 2010 | 4.8 | 
| 54 | Jun | 2010 | 3.21 | 
| 55 | Jul | 2010 | 4.4 | 
| 56 | Aug | 2010 | 3.31 | 
| 57 | Sep | 2010 | 4.81 | 
| 58 | Oct | 2010 | 5.4 | 
| 59 | Nov | 2010 | 3.54 | 
| 60 | Dec | 2010 | 4.48 | 
| for linear trend | seasonal dummies for seasonal variation | ||||||||||||||
| Index | Month | Year | Return(yt) | period(t) | x1 | x2 | x3 | x4 | x5 | x6 | x7 | x8 | x9 | x10 | x11 | 
| 1 | Jan | 2006 | 3.13 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 2 | Feb | 2006 | 4.15 | 2 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 3 | Mar | 2006 | 3.18 | 3 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 4 | Apr | 2006 | 4.94 | 4 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 5 | May | 2006 | 4.34 | 5 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 6 | Jun | 2006 | 4.19 | 6 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 
| 7 | Jul | 2006 | 5.12 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 
| 8 | Aug | 2006 | 5.26 | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 
| 9 | Sep | 2006 | 3.81 | 9 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 
| 10 | Oct | 2006 | 3.1 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 
| 11 | Nov | 2006 | 3.87 | 11 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 
| 12 | Dec | 2006 | 4.89 | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 13 | Jan | 2007 | 3.94 | 13 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 14 | Feb | 2007 | 3.42 | 14 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 15 | Mar | 2007 | 4.13 | 15 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 16 | Apr | 2007 | 3.54 | 16 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 17 | May | 2007 | 4.58 | 17 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 18 | Jun | 2007 | 4.19 | 18 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 
| 19 | Jul | 2007 | 4.62 | 19 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 
| 20 | Aug | 2007 | 3.89 | 20 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 
| 21 | Sep | 2007 | 3.62 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 
| 22 | Oct | 2007 | 3.92 | 22 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 
| 23 | Nov | 2007 | 4.46 | 23 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 
| 24 | Dec | 2007 | 3.23 | 24 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 25 | Jan | 2008 | 4.78 | 25 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 26 | Feb | 2008 | 4.71 | 26 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 27 | Mar | 2008 | 5.05 | 27 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 28 | Apr | 2008 | 3.46 | 28 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 29 | May | 2008 | 3.15 | 29 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 30 | Jun | 2008 | 4.82 | 30 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 
| 31 | Jul | 2008 | 3.87 | 31 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 
| 32 | Aug | 2008 | 3.78 | 32 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 
| 33 | Sep | 2008 | 3.22 | 33 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 
| 34 | Oct | 2008 | 5.39 | 34 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 
| 35 | Nov | 2008 | 4.78 | 35 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 
| 36 | Dec | 2008 | 5.5 | 36 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 37 | Jan | 2009 | 4.8 | 37 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 38 | Feb | 2009 | 5.2 | 38 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 39 | Mar | 2009 | 3.82 | 39 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 40 | Apr | 2009 | 4.52 | 40 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 41 | May | 2009 | 3.53 | 41 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 42 | Jun | 2009 | 4.66 | 42 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 
| 43 | Jul | 2009 | 5.46 | 43 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 
| 44 | Aug | 2009 | 3.49 | 44 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 
| 45 | Sep | 2009 | 3.75 | 45 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 
| 46 | Oct | 2009 | 4.84 | 46 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 
| 47 | Nov | 2009 | 4.83 | 47 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 
| 48 | Dec | 2009 | 4.35 | 48 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 49 | Jan | 2010 | 4.63 | 49 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 50 | Feb | 2010 | 5.32 | 50 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 51 | Mar | 2010 | 4.75 | 51 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 52 | Apr | 2010 | 3.28 | 52 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 53 | May | 2010 | 4.8 | 53 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 
| 54 | Jun | 2010 | 3.21 | 54 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 
| 55 | Jul | 2010 | 4.4 | 55 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 
| 56 | Aug | 2010 | 3.31 | 56 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 
| 57 | Sep | 2010 | 4.81 | 57 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 
| 58 | Oct | 2010 | 5.4 | 58 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 
| 59 | Nov | 2010 | 3.54 | 59 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 
| 60 | Dec | 2010 | 4.48 | 60 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
The regression output for above data taking return as dependent variable(y) and taking period(t) and seasonal dummies as independent variables is given below
| Coefficients | Standard Error | t Stat | P-value | |
| Intercept | 4.24975 | 0.383441215 | 11.08319 | 1.05E-14 | 
| period(t) | 0.006673611 | 0.005562379 | 1.199776 | 0.236239 | 
| x1 | -0.160590278 | 0.466477698 | -0.34426 | 0.732185 | 
| x2 | 0.136736111 | 0.465780744 | 0.293563 | 0.770384 | 
| x3 | -0.2439375 | 0.465149266 | -0.52443 | 0.602445 | 
| x4 | -0.488611111 | 0.464583533 | -1.05172 | 0.298306 | 
| x5 | -0.363284722 | 0.464083783 | -0.7828 | 0.437671 | 
| x6 | -0.235958333 | 0.463650232 | -0.50891 | 0.613193 | 
| x7 | 0.237368056 | 0.463283063 | 0.512361 | 0.610798 | 
| x8 | -0.517305556 | 0.462982436 | -1.11733 | 0.269531 | 
| x9 | -0.627979167 | 0.46274848 | -1.35706 | 0.181243 | 
| x10 | 0.053347222 | 0.462581296 | 0.115325 | 0.908679 | 
| x11 | -0.187326389 | 0.462480956 | -0.40505 | 0.687281 | 
The estimated equation is
Return(y)=4.24975 + 0.00667*period(t) - 0.16059*x1 + 0.13674*x2 -0.24394*x3 -0.48861*x4 - 0.363285*x5 - 0.235958*x6 + 0.237368*x7 - 0.51731*x8 - 0.6279792*x9 + 0.053347*x10 - 0.1873264*x11
The forecasts for first three months of 2011 is as below:
| Year | Month | period(t) | x1 | x2 | x3 | x4 | x5 | x6 | x7 | x8 | x9 | x10 | x11 | Forecasted value from estimated equation(yt) | 
| 2011 | Jan | 61 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4.50 | 
| 2011 | Feb | 62 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4.80 | 
| 2011 | Mar | 63 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4.43 |