Dear R friends

My goal is to eliminate this specific group(1) if the # of NAs in this 
group greater than
50%(specifically say greater than 3). Would you please show me how to do 
it. 
I have a sample data as following:

Thanks a lot.

Kevin Lin

           y group f1 f2 f3
30         NA     1  1  1  1
27         NA     1  1  2  2
48         NA     1  2  1  2
40 -0.6066416     1  2  2  1
24 -0.8323225     1  3  2  2
25  1.3401226     2  1  1  1
13  1.2619082     2  1  2  1
14 -0.4323220     2  3  1  1
36  0.8406529     2  3  2  2
21  0.9604758     3  1  2  1
18  0.9562072     3  2  1  1
45  1.1285016     3  2  1  1
50         NA     4  1  1  1
11         NA     4  1  1  2
41 -1.1017167     4  2  1  1
37  0.9661283     4  3  1  1
39 -0.2540905     4  3  1  2
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