An implementation to reconstruct individual patient data from KaplanMeier (KM) survival curves, visualize and assess the accuracy of the reconstruction, then perform secondary analysis on the reconstructed data. We involve a simple function to extract the coordinates form the published KM curves. The function is developed based on Poisot T. ’s digitize package (2011) <doi:10.32614/RJ2011004> . For more complex and tangled together graphs, digitizing software, such as 'DigitizeIt' (for MAC or windows) or 'ScanIt'(for windows) can be used to get the coordinates. Additional information should also be involved to increase the accuracy, like numbers of patients at risk (often reported at 510 time points under the xaxis of the KM graph), total number of patients, and total number of events. The package implements the modified iterative KM estimation algorithm (modifiediKM) improved upon the approach proposed by Guyot (2012) <doi:10.1186/14712288129> with some modifications.
Package details 


Author  Na Liu [aut, cre], J.Jack Lee [aut, ths], Yanhong Zhou [ctb] 
Maintainer  Na Liu <nliu1104@gmail.com> 
License  GPL2 
Version  0.1.10 
Package repository  View on CRAN 
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