NEW - Check out our NEW program SheCodes Bootcamp - and become a developer in just 4 months!
More
Learn more
Learn how to use looping and code to check if a specific code appears in a R data frame. Set the variable for the ID to 0 or 1 if the code appears or not.
I have a data frame with variables for participants ID, length of hospital stay, hospital stay and disease. There are multiple rows for each ID, as people have multiple values for the disease and length of hospital variable. I want a piece of code that goes through the disease variable, to see if code 111 appears for an ID, if this code appears then the hospital stay variable for that ID will be 0 but if any other disease code appears for the ID, the variable for the ID will be filled with 1. Could you write this code so it is compatible with R?
Sure, the following code should do what you're asking for:
r Copy code
# create a sample data frame
df <- data.frame(
id = c(1,1,2,2,3,3),
stay_length = c(2,3,5,6,1,2),
hospital_stay = c(0,0,0,0,0,0),
disease = c(111,222,333,444,111,555)
)
# loop through the IDs
for (i in unique(df$id)) {
# check if code 111 appears for the ID
if (111 %in% df$disease[df$id == i]) {
# if 111 appears, set hospital stay variable for that ID to 0
df$hospital_stay[df$id == i] <- 0
} else {
# if any other disease code appears, set hospital stay variable for that ID to 1
df$hospital_stay[df$id == i] <- 1
}
}
# print the updated data frame
df
This code loops through each unique ID in the data frame and checks if code 111 appears in the disease variable for that ID. If it does, the hospital stay variable for that ID is set to 0. If any other disease code appears, the hospital stay variable for that ID is set to 1. The updated data frame is then printed.
I have a data frame with variables for participants ID, length of hospital stay, disease and whether they had stayed in hospital over the study period. There are multiple rows for each ID, as people have multiple values for the disease and length of hospital variable. I want a piece of code that goes through each group of IDs, notes if someone has been in hospital longer then 1 day and if they have I want to fill in the rest of the ID rows with 1. Could you write this code so it is compatible with R?
To go through each group of IDs, note if someone has been in the hospital longer than 1 day, and fill in the rest of the ID rows with 1, you can use the dplyr package in R as follows:
r Copy code
library(dplyr)
data_frame %>%
group_by(ID) %>%
mutate(StayedLonger = ifelse(length(unique(Stay)) > 1 & sum(Stay > 1) > 0, 1, 0)) %>%
fill(StayedLonger)
Here, data_frame is the name of your data frame.
First, we group the data by ID using group_by(ID). Then, we create a new variable called StayedLonger by checking whether the length of unique values of stays for an ID is greater than 1 and whether there is at least 1 stay longer than 1 day. If so, we set StayedLonger to 1, otherwise, we set it to 0 using the ifelse() function.
Next, we use fill() to propagate the last observed value of StayedLonger forward to fill in the rest of the rows for each ID. This way, for each ID where someone has stayed longer than 1 day, all the rows for that ID will have StayedLonger set to 1.
Note: Replace "data_frame" with the name of your actual data frame in the code.
