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Recall that b is the row vector of the estimates from the second sampling phase (regression coefficients or BEF values), and Z is the column vector of the estimates from the first phase.
The distribution and elimination phase regression lines were determined by the least square regression methods.
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Joinpoint analysis is known as multiple-phase regression analysis and is based on a Poisson model that fits the observed mortality rates [ 19].
A potential data-based approach to defining biomarker cutoffs may be to construct 2-phase regression models to determine where their slopes change in relation to other biomarkers (68).
The two-phase regression slope after the hinge, corresponding to at least 1 CD4+ T-cell/mm/day decrease or increase, was considered to express a decreasing or an increasing trend, respectively.
The cyclical process of hair growth is divided into 3 following phases: anagen (growth phase), catagen (regression phase), and telogen (resting phase) [ 4].
Hair follicles are miniorgans that, during postnatal life, cycle through periods of anagen (growth phase), catagen (regression phase), and telogen (resting phase) [ 1, 2].
This process is followed by specific cyclic order and characterized by anagen (growth phase), catagen (regression), and telogen (resting phase) [ 1].
After birth, HFs of postnatal (P) day 16 mice reach their full maturation and start an apoptosis-dependent phase of regression, known as catagen.
To analyze the difference between the pre- and post-intervention phase, the regression was tested for autocorrelation in the residuals using the Durbin-Watson test.
For quantification of the phase shift, regression lines are drawn through six to ten activity onsets prior to the light pulse and a minimum of six onsets after the light pulse (Fig. 5A and B).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com