With the following code in a R Notebook file, I run arsenal::tableby from tableby help file. As shown in the screenshot, a row with NA has been added. I have tried both R Markdown and script, and they work fine. Is this a R Notebook issue or an arsenal issue, or that I have done something wrong?
---
title: "R Notebook"
output: html_notebook
---
```{r}
library(arsenal)
data(mockstudy)
tab1 <- tableby(arm ~ sex + age, data=mockstudy)
summary(tab1, text=TRUE)
