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A paired difference test is designed for situations where there is dependence between pairs of measurements (in which case a test designed for comparing two independent samples would not be appropriate). That applies in a within-subjects study design, i.e., in a study where the same set of subjects undergo both of the conditions being compared.
The distinction between unstressed /ɪ/ and /ə/ is lost in GA, while in RP it is retained. Thus in RP, edition /ɪˈdɪʃən/ and addition /əˈdɪʃən/ are not homophones. In GA, flapping is common: when either a /t/ or a /d/ occurs between a sonorant phoneme and an unstressed vowel phoneme, it is realized as an alveolar-flap allophone [ɾ].
Difference in differences (DID [1] or DD [2]) is a statistical technique used in econometrics and quantitative research in the social sciences that attempts to mimic an experimental research design using observational study data, by studying the differential effect of a treatment on a 'treatment group' versus a 'control group' in a natural experiment. [3]
Medical billing, a payment process in the United States healthcare system, is the process of reviewing a patient's medical records and using information about their diagnoses and procedures to determine which services are billable and to whom they are billed.