The Poisson regression in each block of analysis combined variables with a crude p-value <0.20, and between the blocks, the adopted significance was 5%.
By combining variables with 100% specificity for RA (ACPA positivity, metatarsophalangeal joint power Doppler grade of 2 or more involvement and a metacarpophalangeal joint greyscale count of 8 or greater), 76% of VERA patients were identified, including eight of the 15 ACPA-negative individuals.
The Kaplan Meier curves performed with this combined variable indeed revealed three distinct patterns in relation to patient outcome.
It combines variable selection with an efficient computational procedure.
After fitting a full model, we combined variables that were similar with comparable hazard ratios where possible.
Fluxomers combine flux variables with isotopomer variables and consequently reduce the complexity and nonlinearity of the original isotopomer balance equations.
Heuristics and exact methods: Ljubić [33] describes a hybrid heuristic combining Variable Neighborhood Search with a reactive tabu search method.
In the present study, models found by OLS and PLS regression, both combined with variable selection, are compared with regard to interpretation, response optimisation and prediction, for regular mixtures, mixture process and crossed mixture data.
In order to simplify the models we focused on variables for the most common conditions and medications and combined similar variables with comparable HRs where possible.
To simplify the model, we then focused on variables for the most common conditions and medications and combined similar variables with comparable hazard ratios where possible.
