xtevent ln_w age c.age#c.age ttl_exp c.ttl_exp#c.ttl_exp tenure , pol(union) w(3) cluster(idcode) savek(a) 双向固定效应估计reghdfe and two-way clustering xtevent ln_w age c.age#c.age ttl_exp c.ttl_exp#c.ttl_exp tenure
xtevent ln_w age c.age#c.age ttl_exp c.ttl_exp#c.ttl_exp tenure , pol(union) w(3) cluster(idcode) savek(a) 双向固定效应估计reghdfe and two-way clustering xtevent ln_w age c.age#c.age ttl_exp c.ttl_exp#c.ttl_exp tenure , pol(union) w(3) cluster(idcode year) reghdf...