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Table 3 Null models

From: A mixed-methods study of physiological reactivity to domain-specific problem solving: methodological perspectives for process-accompanying research in VET

Parameter Model 1: HR Model 2: RMSSD Model 3: LF/HF ratio Model 4: SCL Model 5: SCR
Estimate S.E. p Estimate S.E. p Estimate S.E. p Estimate S.E. p Estimate S.E. p
Fixed effects
 Intercept .058 .168 .734 .090 .211 .675 −.013 .116 .914 .001 .219 .998 −.004 .108 .968
Random effects
 Residual variance (σ 2e ) .586 .015 <.001 .422 .011 <.001 .765 .020 <.001 .172 .004 <.001 .797 .027 <.001
 Random intercept variance (σ 2u ) .501 .174 .004 .799 .276 .004 .238 .083 .004 .861 .296 .004 .200 .071 .005
ICC .461 .654 .237 .834 .200
n (10-s intervals) 3076 3075 3075 3226 1792