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The use of a sequence of experiments , where the design of each may depend on the results of previous experiments , including the possible decision to stop experimenting , is within the scope of sequential analysis , a field that was pioneered by Abraham Wald in the context of sequential tests of statistical hypotheses .
 Abraham Wald
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Abraham Wald