Fig. 1From: Sleep and physical activity – the dynamics of bi-directional influences over a fortnightThe cross-lagged panel model for sleep and PA. RIx and RIy = Between-subject latent intercept; s1…s14 = Observed sleep; a1….a14 = Observed PA; Wx = within-subject latent sleep excluding between-subject variation; Wy = within-subject latent PA excluding between-subject variationBack to article page