International Scholarly Research Notices / 2012 / Article / Tab 5

Research Article

Predictive Modelling of Wellhead Corrosion due to Operating Conditions: A Field Data Approach

Table 5

Summary of parameter estimate.

VariableCoefficientStandard error value -testLower 95%Upper 95%

0.00380.00620.60980.5475−0.0090.0165
β 420.9970.3862.5850.0160.20281.7927
β 430.23790.10852.19220.03790.01440.4614
β 440.05970.07450.80180.4302−0.09370.2132
−0.45080.6738−0.6690.5097−1.83860.937
β 210.00410.006130.6683080.509827−0.00850.016697
β 220.9480.3783372.5057660.018810.1703411.725707
β 230.23230.1075452.1602940.0401470.0112670.453389
β 310.0031960.0059790.5345450.597507−0.009090.015486
β 320.81960.3609912.2704540.0317010.0775861.561642
β 331.33270.5204212.5608910.0165930.2630012.402483
α 31−0.02610.360199−0.072470.942781−0.766510.714296
α 110.07010.393384 0.17819 0.859904 −0.73706 0.877254
β 110.00510.006513 0.788925 0.437029 −0.00822 0.018501
β 120.79730.396294 2.011877 0.05431 −0.01583 1.610425
α 21−0.00090.370577−0.002450.998066−0.762640.760825