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Questions - difftime

How to get time difference in days since last date (lag) in R using datatable?

person_id diag_date concept_id event diff_prev_event 1: 1 2012-01-15 4265600 comorb NA secs 2: 1 2012-01-15 201820 comorb 0 secs 3: 1 2012-03-15 42...
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sutsabs

r

data.table

lag

difftime

Votes: 0

Answers: 1

Latest Answer

Specify the units library(data.table) dt[order(diag_date),diff_prev_event := difftime(diag_date, lag( diag_date), units = 'days'), by = c("person_id") ] Then, we grouped by 'person_id...
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akrun

Calculating numbers of week for a specific time period

Hi I have this data frame which contains the start and end dates of healthcare services. It looks like this: id <- c("A", "B", "B", "C", "D") start...
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j1234

r

dataframe

difftime

Votes: 0

Answers: 1

Latest Answer

We get the difference in 'weeks' using difftime after making corrections for the '2016' year library(dplyr) df %>% mutate(across(start_date:end_date, as.Date), wks_FY16 = as.integer(difftim...
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akrun

Remove rows that are within 12 months of each other for each participant across 15 years

I am new to R. I have a large dataset that goes over 15 years (2007-2022) (see below an example portion). Essentially, I want to create a 12-month rolling window and remove the rows within 12 months o...
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Jess H

r

dplyr

runner

difftime

Votes: 0

Answers: 1

Latest Answer

With package lubridate, you can remove rows that are not in the beginning of the year: library(tidyverse) library(lubridate) df %>% filter(ymd(Date) == floor_date(ymd(Date), "year")) ...
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Ma&#235;l

difftime returns 0 in C++

I am trying to calculate the elapsed time between the date a book was borrowed and today, but difftime always returns 0. This is what I have : #include <string> #include <iostream> #includ...
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user18160927

c++

datetime

mktime

difftime

Votes: 0

Answers: 0

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