Code:
egen id= group( server_num, CPUAAverageCoreTemperature) xtset id CPUAUtilization xtreg IPMIPower i.CPUAUtilization i.CPUAAverageCoreTemperature Fan1RPM , fe vce(robust) Fixed-effects (within) regression Number of obs = 1,296 Group variable: id Number of groups = 163 R-squared: Obs per group: Within = 0.9573 min = 1 Between = 0.3868 avg = 8.0 Overall = 0.8253 max = 9 F(9,162) = 882.55 corr(u_i, Xb) = 0.0615 Prob > F = 0.0000 (Std. err. adjusted for 163 clusters in id) -------------------------------------------------------------------------------------------- | Robust IPMIPower | Coefficient std. err. t P>|t| [95% conf. interval] ---------------------------+---------------------------------------------------------------- CPUAUtilization | 1 | 45.0428 1.088814 41.37 0.000 42.8927 47.1929 2 | 65.8275 1.355795 48.55 0.000 63.15019 68.50481 3 | 81.43575 2.302044 35.38 0.000 76.88986 85.98163 4 | 99.49748 3.169925 31.39 0.000 93.23778 105.7572 5 | 101.0006 3.407896 29.64 0.000 94.27099 107.7302 6 | 104.4599 3.555344 29.38 0.000 97.43913 111.4807 7 | 106.5967 3.766806 28.30 0.000 99.15836 114.0351 8 | 107.0671 3.877293 27.61 0.000 99.41051 114.7236 | CPUAAverageCoreTemperature | 72 | 0 (omitted) 74 | 0 (omitted) | Fan1RPM | .0151772 .0019755 7.68 0.000 .0112762 .0190783 _cons | 28.71307 4.337745 6.62 0.000 20.14726 37.27889 ---------------------------+---------------------------------------------------------------- sigma_u | 18.396744 sigma_e | 9.5483104 rho | .78778394 (fraction of variance due to u_i) --------------------------------------------------------------------------------------------
1- can I use the model in this way to get the coefficient of CPUAUtilization- this variable is used in xtset- ? can I say that when the cpu utilization=2 then the IPMIPower increased by 65?
2- I want to see the coefficient of CPUAAverageCoreTemperature as well- used in xtset - but it is omitted? how to check the coefficent for this time invariant variable? should I switch to random effect?
To conclude, can I include the variables used in xtset as independent variable in the model and interrupt them as we interrupt other independent variable?
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