Appendix: the Selection Criterion Equation
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چکیده
The CURDS data set contains detailed information on the level of ownership of CNCs by each firm in the sample incorporating date of first adoption. This allows us to classify the sample firms in 1993 into 4 categories: non adopters; currently diffusing users; complete users; and ex users. Of the total sample of 343 firms, 59 firms were excluded on the grounds that CNC was not an appropriate technology, of the remaining 284 eligible firms in 1993 there are ten ex users, four complete users, 208 diffusing users and 62 non adopters. The number of complete users and ex users is too small to enable us to statistically model the censoring due to their exclusion from the sample used for estimating the intra firm diffusion model and thus we just remove these observations and instead concentrate upon modelling the distinction between non adopters and firms diffusing in 1993.
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