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Statistical
modelling/Milk offtake
Changing the LOCATION code can be done using the factor
reordering facility (Spread FactorReorder levels...). The factor levels
themselves do not change in the spread sheet but they are considered to occur in a
different order.
The parameter value for LOCATION 1 for Bilisa is now shown (the
same value as before but with the sign reversed). The constant term value of
1.314 now refers to Assa and its standard error can be seen to be the value
0.125 included in the equation on the previous page.
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***** Regression Analysis *****
Response variate: TOTALM
Fitted terms: Constant + LOCATION + AGEC
*** Summary of analysis ***
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d.f. |
s.s. |
m.s. |
v.r. |
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Regression |
2 |
27.12 |
13.5612 |
40.08 |
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Residual |
161 |
54.47 |
0.3383 |
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Total |
163 |
81.60 |
0.5006 |
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*** Estimates of parameters ***
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estimate |
s.e. |
t(161) |
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Constant |
1.314 |
0.125 |
10.52 |
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LOCATION 1 |
0.8218 |
0.0971 |
8.46 |
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AGEC |
-0.0511 |
0.0169 |
-3.02
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Parameters for factors are differences compared with the reference level:
Factor Reference level
LOCATION 2
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