inject_nas()
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Apply random or systematic missingness to existing data according to recipe |
miss_as_block()
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Function constructor for injecting "missing together" NAs to columns |
miss_at_random()
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Function constructor for injecting independent missing-at-random NAs to columns |
pct_orig secs_per_year secs_per_day rand_posixct()
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Generate a sample of random datetimes |
rep_per_key() rand_per_key()
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Convenience helper functions for defining relational-join recipes |
sample_fct() sample_yn() rep_n() seq_n()
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Create a factor with random elements of x |
subjid_func()
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Generate sequence of "subject id"s |