Perhaps you should try some spelling variations:
statistical independence » statistical inference, statistical evidence
statistical inferences » statistical inference, statistical convergence
statistical services » statistical survey
statistical studies » statistical study, statistical survey, statistical theories

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• If you are trying to use Boolean operators, they must be ALL CAPS: ((((statistical services) OR (statistical studies))) OR (((statistical inferences) OR (statistical independence)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((statistical services) or (statistical studies))) or (((statistical inferences) OR (statistical independence))))".
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