A short tutorial of GPower

Mayr, Susanne; Erdfelder, Edgar; Buchner, Axel; Faul, Franz

doi:10.20982/tqmp.03.2.p051

Cited by 354 publications

(206 citation statements)

References 8 publications

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“…We calculated E(S), E(F), and PIE using the application Diversity. We used GPower (Mayr et al, 2007) to estimate power using our sampling design and sample size with the standard a priori estimate for effect size of 0.5 (Cohen, 1988;Bausell and Li, 2002). Planned t-tests contrasting terrestrial assemblages as a function of wetland type had an a priori power of 0.70, and the suite of 2 3 2 ANOVAs had power of 0.94 or better.…”

Section: Resultsmentioning

confidence: 99%

Influences of forest harvest and environmental gradients on aquatic invertebrate communities of seasonal ponds

et al. 2009

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Section: Resultsmentioning

confidence: 99%

Influences of forest harvest and environmental gradients on aquatic invertebrate communities of seasonal ponds

et al. 2009

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“…The area under the curve (AUC) was calculated, the 95% confidence intervals (95% CI) were determined, and the cut-off and performance quantifiers such as sensitivity and specificity were calculated. The required total sample size for a 90% power of the χ 2 test and a moderate effect size (w=0.3), computed using GPower v3.1.9.2 software [14] was of 117 subjects. All continuous data were expressed as mean ± standard deviation.…”

Section: Statisticsmentioning

confidence: 99%

Performance of the Standard 22G Needle for Endoscopic Ultrasound-guided Tissue Core Biopsy in Pancreatic Cancer

Seicean

Gheorghiu

Zaharia

et al. 2016

JGLD

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Background & Aim: Endoscopic ultrasonography (EUS) and EUS-guided fine-needle aspiration (EUS-FNA) are considered good tools for the diagnosis of pancreatic cancer and for obtaining material for cytology or histology. The accuracy of EUS-FNA can rise to 85-95%, but it is lower in cases with a chronic pancreatitis background or with previous biliary stenting. We aimed to establish the diagnostic yield of the visible length of the core biopsy samples in pancreatic cancer by using one single type of standard 22G needle and to evaluate the factors which can influence the results. Method: EUS-FNA was performed by using a 22G standard needle on patients prospectively recruited with the suspicion of pancreatic masses on transabdominal ultrasound or CT scan over a period of eight months. The number of passes was limited by the length of the core obtained. The final diagnosis was based on EUS-FNA or hepatic biopsy for their metastasis or by follow up every three month by imaging methods. Results: The study included 118 patients. Previous stents were present in 10 patients and chronic pancreatitis features were found in 3 patients. The procedure sensitivity was 89% and the global accuracy was 89%. The presence of biliary stents did not impede the accuracy of results. The number of passes did not influence the results. Conclusions: The diagnostic rate of core biopsy by using 22G needles had a high accuracy and it is safe when the length of core dictates the number of passes. The presence of biliary stents did not influence the results. Abbreviations: AUC: area under the curve; EUS: endoscopic ultrasonography; EUS-FNA: fine needle aspiration under endosonographic guidance; FNA: fine needle aspiration; INR: international normalised ratio; OR: odds ratio.

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“…The sample composition was analyzed a priori and a posteriori statistical power. Mayr et al (2007) explains that the statistical power is essential for the evaluation of statistical decisions, as well as for the design of the data. Thus, the G* Power 3.0 software was used to verify the adequacy of the sample.…”

Section: Sample Size and Statistical Powermentioning

confidence: 99%

Intention to Read News on the Internet: A Brazilian Public Analysis

Andrade¹,

Lima²,

Pereira

2015

IBR

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The main objective of the research was to identify factors related to the usage of the Internet service of readings, assessed by Brazilian readers and evaluate the intended use of readers based on the factors we have found. The methodological procedures involved conducted an online survey research, with the formation of a database formed by the Brazilian public that uses the Internet. Multivariate analysis techniques, such as exploratory factor analysis and logistic regression analysis were used. In the perception of the readers, there are three dimensions that differentiate the innovative user from the late user regarding the use of the web to read news, namely: the practicality of the platform, knowledge of technology and the external influence. From the results it can be concluded that the innovative public drives the latent growth of reading newspapers on the Internet and those who do not intend to use in the future may become users following the evolution and popularization of digital media

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A short tutorial of GPower

Cited by 354 publications

References 8 publications

Influences of forest harvest and environmental gradients on aquatic invertebrate communities of seasonal ponds

Influences of forest harvest and environmental gradients on aquatic invertebrate communities of seasonal ponds

Performance of the Standard 22G Needle for Endoscopic Ultrasound-guided Tissue Core Biopsy in Pancreatic Cancer

Intention to Read News on the Internet: A Brazilian Public Analysis

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