[R] HLM Model

[Belle]

Hi

I am trying to convert SAS codes to R, but some of the result are quite
different from SAS. 

When I ran proc mixed, I have an option ddfm=bw followed by the model. How
can I show this method in R　(I am thinking that this maybe the reason that I
can't get the similar results)

below is my SAS codes:

proc mixed data=test covtest empirical;
class pair grade team school;
	model score = trt pair grade school/ solution covb ddfm=bw ;
	random int /  sub=team solution type=un;
run;

I have tried both lmer and hglm, but non of them works.

Could anyone tell me how can I covert this SAS codes to R? Thanks
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