search for: 324311

Hello Everyone, I just started a new job & it requires heavy use of R to analyze datasets. I have a data.table that looks like this. It is sorted by ID & Date, there are about 150 different IDs & the dataset spans 3 million rows. The main columns of concern are ID, date, and totret. What I need to do is to derive daily returns for each ID from totret, which is simply totret at time

...395034 demand_metadata_hits 67029 demand_metadata_misses 5689 evict_skip 82546 hash_chain_max 18 hash_chains 62589 hash_collisions 1271045 hash_elements 324311 hash_elements_max 324325 hdr_size 47095464 hits 797015 l2_abort_lowmem 0 l2_cksum_bad 0 l2_evict_lock_retry 0 l2_evict_reading 0 l2_feeds...