How to reset a sequence in a R dataframe's column, based on the levels of a different column Problem Description: I have data that logs subject and session information in columns like so: > Subject <- c(rep("A", 6), rep("B", 7)) > Session <- c(rep(1, 3), rep(2, 3), rep(8, 4), rep(9, 3)) > df <- data.frame(Subject, … Read more
looping over dataframes and looping over variables in a dataframe Problem Description: Stata user here, having trouble with loops in R. I won’t trouble you with the "how I would do it in stata" caveat; my issue sis that using loops (or apply) I cannot figure out how to properly loop through data frames or … Read more
Programatically generate tabset panels of datatables in Quarto Problem Description: This question is similar, but not identical to this one. Basically, I have a number of tables that I would like to show in tabsets using DT::datatable(). Unfortunately, I can’t figure out how. The following code works, but I need to manually type all the … Read more
Do results of survival analysis only pertain to the observations analyzed? Problem Description: Hey guys, so I taught myself time-to-event analysis recently and I need some help understanding it. I made some Kaplan-Meier survival curves. Sure, the number of observations within each node is small but let’s pretend that I have plenty. K <- HF … Read more
How do I sort dates by month in R? Problem Description: new R student here. I am trying to sort data by month. Here is a sample of the data I need to use, followed by the code, then my results. Any tips for how to accomplish this?! I’m super stuck… This is the latest … Read more
Using substring of file name to create new variable in a list of dataframes Problem Description: I have a directory with a set of .rds files containing dataframes: files <- c("file_2022-11-30.rds", "file_2022-12-01.rds") I want to read each file into a list and then assign a new column to each dataframe in the list that contains … Read more
2 separate legends for the same aesthetic ggplot2 Problem Description: I am trying to get 2 separate legends for different groups of variables when using "facet_wrap" in ggplot 2. Basically I want to break up the legend into 2, one with "Yes/No" and one with "Sometimes/Never" and have each one close to those variables that … Read more
Check if the corresponding elements in two different list of dataframes are equal Problem Description: I have a two separate list of dataframes. The first list of dataframe is lst1 $`1` [1] 8.523769e-05 6.615035e-05 1.177740e-04 1.173578e-04 8.798214e-05 6.328218e-05 4.768889e-05 3.658710e-05 [9] 1.294623e-05 1.179838e-06 1.010590e-06 5.204994e-07 2.128048e-06 6.876634e-06 6.011750e-06 5.160903e-05 [17] 5.318722e-05 1.029438e-04 1.173397e-04 $`2` [1] … Read more
Sorting with order in R with the whole data frame Problem Description: I have a data frame that I’d like to order based on a vector of IDs and on the all the columns of another data frame. id.namestest = data.frame(test = NA, id= c("id1", "id2", "id3","id3", "id2", "id1")) head(admix) # V1 V2 V3 # … Read more
For loop in R not working to update data set Problem Description: I am trying to apply this for loop across the given minimal dataset. Each row of the dataset is associated with a patient, with each patient having two rows of information. The aim is that the cohort of each patient is determined. Each … Read more