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etsi  

Efficient Testing Using Surrogate Information
View on CRAN: Click here


Download and install etsi package within the R console
Install from CRAN:
install.packages("etsi")

Install from Github:
library("remotes")
install_github("cran/etsi")

Install by package version:
library("remotes")
install_version("etsi", "1.0")



Attach the package and use:
library("etsi")
Maintained by
Layla Parast
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2025-11-06
Latest Update: 2025-11-06
Description:
Provides functions for treatment effect estimation, hypothesis testing, and future study design for settings where the surrogate is used in place of the primary outcome for individuals for whom the surrogate is valid, and the primary outcome is purposefully measured in the remaining patients. More details are available in: Knowlton, R., Parast, L. (2024) “Efficient Testing Using Surrogate Information," Biometrical Journal, 67(6): e70086,<doi:10.1002/bimj.70086>. A tutorial for this package can be found at <https://www.laylaparast.com/etsi>.
How to cite:
Layla Parast (2025). etsi: Efficient Testing Using Surrogate Information. R package version 1.0, https://cran.r-project.org/web/packages/etsi. Accessed 21 Aug. 2026.
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