@article{Khor:126212,
      recid = {126212},
      author = {Khor, Ling Yee and Zeller, Manfred},
      title = {Doubts on input quality: The effect of inaccurate  fertilizer content on the estimation of production  functions and technical efficiency},
      address = {2012},
      number = {1007-2016-79414},
      series = {Selected Paper},
      pages = {21},
      year = {2012},
      abstract = {Household survey responses regarding levels of input use  are sometimes affected by bias of which even the households  themselves are not aware. Some examples include poor  quality seed with a mixture of the fertile and infertile  types, and pesticide content that has been substituted with  less effective chemicals. We analyze in our paper the  effect of low quality fertilizer, which contains less  nitrogen than is advertised on the packaging. We show that  this could lead to bias in the estimation of marginal  effect and technical efficiency. Using panel data from the  Hebei province of China, we calculate the magnitude of the  bias across different levels of fertilizer quality. We find  that the bias could be between -2% and -7% for marginal  effect of fertilizer at mean input levels, and between 1%  and 4% for technical efficiency.},
      url = {http://ageconsearch.umn.edu/record/126212},
      doi = {https://doi.org/10.22004/ag.econ.126212},
}