 social structur group scientist a test invis colleg hypothesi the exist social organ area infer scientist publish area social ti scientist publish scientist publish area differenti degre od social particip area us mail questionnair sociometr data type scientif relationship scientist publish problem area respond chose scientist publish area chose scientist area analysi direct indirect ti cleman's method analysi sociometr connected reveal tie highli product scientist brought scientist product larg network influenc commun similar type social organ social circl discuss 