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Block randomization
self_blockrand(N=N,trt_levels=trt_levels,blocksize=blocksize,rand_ratio=rand_ratio)
Total number of patients
treatment levels in vector. for example, c(0,1) for control vs treatment trial.
Randomization block size
Randomization ratio between control and treatment
# NOT RUN { self_blockrand(N=100,trt_levels=c(0,1),blocksize=2,rand_ratio=c(1,1)) # }
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