Variance function in regression analysis of longitudinal data using the generalized estimating equation approach

2013 ◽  
Vol 84 (12) ◽  
pp. 2700-2709 ◽  
Author(s):  
Xuemao Zhang ◽  
Sudhir Paul
Biometrics ◽  
1988 ◽  
Vol 44 (4) ◽  
pp. 1049 ◽  
Author(s):  
Scott L. Zeger ◽  
Kung-Yee Liang ◽  
Paul S. Albert

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