Welcome to Tplyr! Tplyr is a grammar of data format and summary. It’s designed to simplify the creation of clinical safety summaries and help you focus on how you present your data rather than redundant summaries being performed.
As always, we welcome your feedback. If you spot a bug, would like to see a new feature, or if any documentation is unclear - submit an issue through GitHub right here.
Take a look at the cheatsheet!
You can Tplyr install with:
# Install from CRAN: install.packages("Tplyr") # Or install the development version: devtools::install_github("https://github.com/atorus-research/Tplyr.git")
dplyr from tidyverse is a grammar of data manipulation. So what does that allow you to do? It gives you, as a data analyst, the capability to easily and intuitively approach the problem of manipulating your data into an analysis ready form.
dplyr conceptually breaks things down into verbs that allow you to focus on what you want to do more than how you have to do it.
Tplyr is designed around a similar concept, but its focus is on building summary tables within the clinical world. In the pharmaceutical industry, a great deal of the data presented in the outputs we create are very similar. For the most part, most of these tables can be broken down into a few categories:
For many of the tables that go into a clinical submission, at least when considering safety outputs, the tables are made up of a combination of these approaches. Consider a demographics table - and let’s use an example from the PHUSE project Standard Analyses & Code Sharing - Analyses & Displays Associated with Demographics, Disposition, and Medications in Phase 2-4 Clinical Trials and Integrated Summary Documents.
When you look at this table, you can begin breaking this output down into smaller, redundant, components. These components can be viewed as ‘layers’, and the table as a whole is constructed by stacking the layers. The boxes in the image above represent how you can begin to conceptualize this.
So we have one table, with 6 summaries (7 including the next page, not shown) - but only 2 different approaches to summaries being performed. In the same way that
dplyr is a grammar of data manipulation,
Tplyr aims to be a grammar of data summary. The goal of
Tplyr is to allow you to program a summary table like you see it on the page, by breaking a larger problem into smaller ‘layers’, and combining them together like you see on the page.
Enough talking - let’s see some code. In these examples, we will be using data from the PHUSE Test Data Factory based on the original pilot project submission package. Note: You can see our replication of the CDISC pilot using the PHUSE Test Data Factory data here.
tplyr_table(adsl, TRT01P, where = SAFFL == "Y") %>% add_layer( group_desc(AGE, by = "Age (years)") ) %>% add_layer( group_count(AGEGR1, by = "Age Categories n (%)") ) %>% build() %>% kable()
|row_label1||row_label2||var1_Placebo||var1_Xanomeline High Dose||var1_Xanomeline Low Dose||ord_layer_index||ord_layer_1||ord_layer_2|
|Age (years)||Mean (SD)||75.2 ( 8.59)||74.4 ( 7.89)||75.7 ( 8.29)||1||1||2|
|Age (years)||Q1, Q3||69.2, 81.8||70.8, 80.0||71.0, 82.0||1||1||4|
|Age (years)||Min, Max||52, 89||56, 88||51, 88||1||1||5|
|Age Categories n (%)||<65||14 ( 16.3%)||11 ( 13.1%)||8 ( 9.5%)||2||1||1|
|Age Categories n (%)||>80||30 ( 34.9%)||18 ( 21.4%)||29 ( 34.5%)||2||1||2|
|Age Categories n (%)||65-80||42 ( 48.8%)||55 ( 65.5%)||47 ( 56.0%)||2||1||3|
We understand how important documentation and testing is within the pharmaceutical world. This is why outside of unit testing ’Tplyr includes an entire user-acceptable testing document, where requirements were established, test-cases were written, and tests were independently programmed and executed. We do this in the hope that you can leverage our work within a qualified programming environment, and that we save you a substantial amount of trouble in getting it there.
You can find the qualification document within this repository right here. The ‘uat’ folder additionally contains all of the raw files, programmatic tests, specifications, and test cases necessary to create this report.
Here are some of the high level benefits of using
There’s quite a bit more to learn! And we’ve prepared a number of other vignettes to help you get what you need out of ‘Tplyr’.
In building ‘Tplyr’, we needed some additional resources in addition to our personal experience to help guide design. PHUSE has done some great work to create guidance for standard outputs with collaboration between multiple pharmaceutical companies and the FDA. You can find some of the resource that we referenced below.