## Output from fitstep.sas

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```             Illustrate stepwise selection using the Fitness Data            1
Stepwise Selection
```
`              Stepwise Procedure for Dependent Variable OXY`
```The first 2 variables are forced into the model because of the INCLUDE=
option.

Step 0  The First  2 Vars Entered   R-square = 0.15063534   C(p) =109.70567678
```
`                DF         Sum of Squares      Mean Square          F   Prob>F`
```Regression       2           128.24814438      64.12407219       2.48   0.1017
Error           28           723.13340046      25.82619287
Total           30           851.38154484
```
```                Parameter        Standard          Type II
Variable         Estimate           Error   Sum of Squares          F   Prob>F```
```INTERCEP      77.29049413     13.85462884     803.75329459      31.12   0.0001
AGE           -0.37041610      0.18310074     105.69633373       4.09   0.0527
WEIGHT        -0.15823204      0.11457181      49.25991780       1.91   0.1782

Bounds on condition number:     1.057687,     4.230747
------------------------------------------------------------------------------

Step 1   Variable RUNTIME Entered   R-square = 0.77083060   C(p) = 13.34530613
```
`                DF         Sum of Squares      Mean Square          F   Prob>F`
```Regression       3           656.27094936     218.75698312      30.27   0.0001
Error           27           195.11059548       7.22631835
Total           30           851.38154484
```
```                Parameter        Standard          Type II
Variable         Estimate           Error   Sum of Squares          F   Prob>F```
```INTERCEP      93.12615008      7.55915630    1096.76539223     151.77   0.0001
AGE           -0.17387679      0.09954587      22.04722118       3.05   0.0921
WEIGHT        -0.05443652      0.06180913       5.60521700       0.78   0.3862
RUNTIME       -3.14038657      0.36737984     528.02280498      73.07   0.0001

Bounds on condition number:     1.117292,     9.888012
------------------------------------------------------------------------------

Step 2   Variable RUNPULSE Entered  R-square = 0.81649255   C(p) =  8.10351211
```
`                DF         Sum of Squares      Mean Square          F   Prob>F`
```Regression       4           695.14669132     173.78667283      28.92   0.0001
Error           26           156.23485352       6.00903283
Total           30           851.38154484
```
```                Parameter        Standard          Type II
Variable         Estimate           Error   Sum of Squares          F   Prob>F```

```             Illustrate stepwise selection using the Fitness Data            2
Stepwise Selection
```
```INTERCEP     115.66229667     11.22578205     637.90350440     106.16   0.0001
AGE           -0.27641726      0.09932454      46.53950756       7.74   0.0099
WEIGHT        -0.04932333      0.05639914       4.59583505       0.76   0.3898
RUNTIME       -2.77236856      0.36492045     346.82476452      57.72   0.0001
RUNPULSE      -0.12932379      0.05084420      38.87574195       6.47   0.0173

Bounds on condition number:     1.356487,     20.30177
------------------------------------------------------------------------------

Step 3   Variable MAXPULSE Entered  R-square = 0.84800181   C(p) =  5.10627546
```
`                DF         Sum of Squares      Mean Square          F   Prob>F`
```Regression       5           721.97309402     144.39461880      27.90   0.0001
Error           25           129.40845082       5.17633803
Total           30           851.38154484
```
```                Parameter        Standard          Type II
Variable         Estimate           Error   Sum of Squares          F   Prob>F```
```INTERCEP     102.20427520     11.97928972     376.78934930      72.79   0.0001
AGE           -0.21962138      0.09550245      27.37429100       5.29   0.0301
WEIGHT        -0.07230234      0.05331009       9.52156710       1.84   0.1871
RUNTIME       -2.68252297      0.34098544     320.35967836      61.89   0.0001
RUNPULSE      -0.37340085      0.11714109      52.59623720      10.16   0.0038
MAXPULSE       0.30490783      0.13393642      26.82640270       5.18   0.0316

Bounds on condition number:     8.731225,     104.8254
------------------------------------------------------------------------------

All variables left in the model are required or significant at the 0.1500
level.
No other variable met the 0.1500 significance level for entry into the model.```
```
Summary of Stepwise Procedure for Dependent Variable OXY

Variable        Number   Partial    Model
Step   Entered Removed     In      R**2     R**2      C(p)          F   Prob>F```
```   1   RUNTIME              3    0.6202   0.7708   13.3453    73.0694   0.0001
2   RUNPULSE             4    0.0457   0.8165    8.1035     6.4696   0.0173
3   MAXPULSE             5    0.0315   0.8480    5.1063     5.1825   0.0316```