This function takes a sema dataset (must contain variables sema_id, timedlv and datedlv) and calculates the time interval between successive rows. It will overwrite the interval variable created by clean_sema, but may be useful for re-calculating intervals on datasets you have trimmed to only included surveys with responses.
1  | get_interval(semadata)
 | 
semadata | 
 An R dataframe containing both sema_id and datedlv variables (most likely, a sema dataset -after- processing with clean_sema)  | 
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