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

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