1999
DOI: 10.1097/00004032-199910000-00013
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Basic Applications of the Chi-Square Statistic Using Counting Data

Abstract: The chi-square statistic has many scientific applications, including the evaluation of variance in counting data and the proper functioning of a radiation counting system. This paper provides a discussion of the fundamental aspects of the chi-square test using counting data. Practical applications of the chi-square statistic are discussed, including the estimation of extra-Poisson variance and dead time for a counting system. The consequences of passing or failing the chi-square test are discussed regarding th… Show more

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Cited by 9 publications
(3 citation statements)
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“…One-tailed chi-square analyses (cf. Tries, Skrable, French, & Chabot, 1999) and one-tailed z ratios for the significance of the difference between two independent proportions tested hypotheses dealing with agreement in goal inferences. Although the chi-square tests allowed for the examination of predicted correlations among the discrete variables, z ratios tested the precise predictions of the differences in particular frequencies with which participants inferred goals.…”
Section: Resultsmentioning
confidence: 99%
“…One-tailed chi-square analyses (cf. Tries, Skrable, French, & Chabot, 1999) and one-tailed z ratios for the significance of the difference between two independent proportions tested hypotheses dealing with agreement in goal inferences. Although the chi-square tests allowed for the examination of predicted correlations among the discrete variables, z ratios tested the precise predictions of the differences in particular frequencies with which participants inferred goals.…”
Section: Resultsmentioning
confidence: 99%
“…PET singles data with varying incoming singles rates (from approximately 50 Mcps to 500 Mcps) were simulated using GATE v8.0. The GATE installation was checked using a Poisson validation protocol based on a method described by Tries et al (1999). The simulations included an LYSO-based total-body PET scanner and a waterbased cylindrical phantom (16 cm dia., 150 cm long) with a centered line source (6 mm dia., 150 cm long).…”
Section: Test Datamentioning
confidence: 99%
“…Η καταγραφή της συχνότητας των επιπλοκών έγινε και µε την αναφορά τους σε 1000 ηµέρεςκαθετήρα (επιπλοκές ανά 1000 ηµέρες κατά τις οποίες καθετήρας ήταν τοποθετηµένος στους ασθενείς). Μετά τη συγκέντρωση των αποτελεσµάτων, έγινε σύγκριση της συχνότητας των επιπλοκών µεταξύ των δύο οµάδων µε τη χρήση ενδεδειγµένης στατιστικής µεθόδου (Χ-test) (188). Τιµή p< 0.05 θεωρήθηκε στατιστικά σηµαντική.…”
Section: επεξεργασια των αποτελεσματωνunclassified