Table 1

Proportion (s) at which each of the variables entered the final model and average p-value for three automated model selection procedures based on one thousand bootstrap samples

Variables

Forward selection

Backward selection

Stepwise selection

s

p-value

s

p-value

s

p-value


Age

1.000

0.0003

0.999

0.0002

0.998

0.0003

Baseline WBC

0.991

0.0067

0.957

0.0028

0.951

0.0027

Splenomegay

0.767

0.0424

0.600

0.0071

0.610

0.0071

T-cell immunophenotype

0.748

0.0408

0.593

0.0043

0.588

0.0042

Sex

0.719

0.0493

0.465

0.0141

0.455

0.0137

Mediastinal mass

0.648

0.0576

0.450

0.0056

0.451

0.0055

Hepatomegaly

0.493

0.0621

0.307

0.0111

0.292

0.0108


Beyene et al. BMC Medical Research Methodology 2009 9:64   doi:10.1186/1471-2288-9-64

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