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We found that such procedure had little effect on the non-proportional hazard (p = 0.06), and decided to retain "farm area" as a covariate as none of the other model diagnostics revealed violations of PH assumptions.
Model diagnostics revealed that the non-transformed mean usage did not fit the data well due to a high leverage point (influential point).
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In this model, both predictors were highly significant, with model diagnostics revealing normally distributed, homoscedastic residuals.
While examining this model diagnostic reveals whether the proportional hazards assumption is met or not, such residual plots will not so easily give information on the nature of non-proportionalities.
Above all, the rock physics diagnostics revealed that the model matches the data from the study area, meaning that it is consistent with the geological background of the study interval.
Morphological diagnostics revealed osteosarcoma in all cases.
Regression diagnostics revealed nonlinearity in the relationship between TWA and CPT2000, which was addressed by including a quadratic term in the model.
Collinearity diagnostics revealed no problematic multicollinearity among the independent variables.
Collinearity diagnostics revealed that among all the significantly correlated variables, prebronchodilator FEV1 had a high degree of multicollinearity (tolerance = 0.175, variable inflation factor = 5.717), hence it was removed from the final multiple linear regression model.
These diagnostics reveal similarities between the topology of CH4/air and CH4/O2/CO2 flames near their stabilization point.
The final model satisfied the Hosmer-Lemeshow test for goodness of fit, but exploring model diagnostics and coefficients for stratified variables revealed that the effect of heart rate was not entirely linear.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com