lik_diff_measure

main_list includes survival indicator variable, Duration time of survival variable and basic group variable.

main_list

stage_list is numerical form of each scheme by using other of stages information.

stage_list

Covariate variables taking into consideration.

covar_list

data

<code>lik_diff_measure</code> returns likelihood difference for the grouping scheme.

T (extent of the primary tumor), N (absence or presence and extent of regional lymph node metastasis) and M (absence or presence of distant metastasis) are three components to describe the anatomical tumor extent. TNM stage is important in treatment decision-making and outcome predicting. The existing oropharyngeal Cancer (OPC) TNM stages have not made distinction of the two sub sites of Human papillomavirus positive (HPV+) and Human papillomavirus negative (HPV-) diseases. We developed novel criteria to assess performance of the TNM stage grouping schemes based on parametric modeling adjusting on important clinical factors. These criteria evaluate the TNM stage grouping scheme in five different measures: hazard consistency, hazard discrimination, explained variation, likelihood difference, and balance. The methods are described in Xu, W., et al. (2015) <https://www.austinpublishinggroup.com/biometrics/fulltext/biometrics-v2-id1014.php>.

lik_diff_measure: Likelihood difference measurement.

Description

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References