bdiff组间系数差异检验5000次，我的命令是bdiff , group(a) model (reg y x controls m1-m14 n1-n21) reps(5000) detail，结果报错显示为no room to add more variables Up to 5,000 variables are currently allowed, although you could reset the maximum using set maxvar; see help memory.，请问各位老师怎么解决这个问题。谢谢各位老师。