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PDA surrogate estimation
ODACATH.estimate(ipdata,control,config)
list(btilde=betanew, btilde.se=beta_SE,eta_mat=eta_mat,eta_mat_theta=NULL,site=config$site_id, site_size=n_site)
local data in data frame
PDA control
cloud configuration
step-3: construct and solve surrogate efficient score at the master/lead site