1. 
   non-orthogonal sampling
   sampling of a picture where the points on the scanning lines corresponding to the sampling instants are not aligned in the picture perpendicularly to the scanning line direction NOTE - In the case of progressive scanning, the points in a scanning line are not aligned with those points in the tempora...
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=723-10-25
   
   
2. 
   nonprobability sampling
   (from the article `sampling`) An alternative to probability sampling is judgment sampling, in which selection is based on the judgment of the researcher and there is an unknown ... ...surveyed. Probability sampling methods, where the probability of each unit appearing in the sample is known, enable ...
   Found op http://www.britannica.com/eb/a-z/n/49
   
   
3. 
   Nonprobability sampling
   Sampling is the use of a subset of the population to represent the whole population. Probability sampling, or random sampling, is a sampling technique in which the probability of getting any particular sample may be calculated. Nonprobability sampling does not meet this criterion and should be used...
   Found op http://en.wikipedia.org/wiki/Nonprobability_sampling
   
   

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