Hans Fricke, Markus Fruelich, Martin Huber, and Michael Lechner, 
"Endogeneity and Non-Response Bias in Treatment Evaluation-- 
Nonparametric Identification of Causal Effects by Instruments", Journal 
of Applied Econometrics, Vol. 35, No. 5, 2020, pp. 481-504.

All files are zipped in the file ffhl-files.zip. The two text files
are in DOS format.

"expdata.csv" contains the experimental data considered in the
application (see Section 6) in csv format.

"expdata.RData" contains the data in R format. 

"attrition late public use code.R" contains the R code for replicating
the empirical results in Table 6.