Statistical Power Analysis for the Behavioral Sciences, Revised Edition.

Daly, J.C.; Cohen, Jacob

doi:10.2307/2286629

Cited by 110 publications

(9 citation statements)

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“…In other areas of the cortex (CCX), such as the frontal accessory (FrAc) (WT-11wks = 13.9 ± 2.3 mm 3 vs R6/1 (11wks) = 7.35 ± 0.45 mm 3 , p<0.02) (47.1% decrease), and cingulate cortex (Cing) (WT-11wks = 7.57 ± 0.52 mm 3 vs R6/1 (11wks) = 5.0 ± 0.57 mm 3 , p<0.01) (33.97% decrease), significant presymptomatic volumetric decreases were accounted for. Additional normalization of each brain structure by the total brain volume on each experimental group and effect size analysis (Daly and Cohen, 1987;Rosenthal and Rosnow, 1984) is shown in Supplementary Table 1. These results show that the R6/1 model depicts changes as already described in other HD mouse models and was further analyzed.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of early microstructural changes in the R6/1 mouse model of Huntington's disease by ultra-high field diffusion MR imaging

Gatto

Weissmann

Amin

et al. 2021

Neurobiology of Aging

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Section: Discussionmentioning

confidence: 99%

Evaluation of early microstructural changes in the R6/1 mouse model of Huntington's disease by ultra-high field diffusion MR imaging

Gatto

Weissmann

Amin

et al. 2021

Neurobiology of Aging

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“…Power analysis was performed using at alpha = 0.05 and number of predictors of = 7, to detect a medium Cohen’s d effect size = 0.15, and the total sample size was calculated to be 153 with an actual power of 0.95. The G*Power software 50 was used to determine the sample size and power calculations because of it is an open source software that is easy to use 51 – 53 . The sample size was however increased to the total sample size of 341 farmers, to accommodate two other studies that used the same survey instrument to collect information on ecological attitudes and willingness to pay using discrete choice experiments.…”

Section: Methodsmentioning

confidence: 99%

Behavioral intentions of rural farmers to recycle human excreta in agriculture

Gwara

Wale

Odindo

2022

Sci Rep

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Considerable progress has been made in developing human excreta recovery pathways and processes for maximum nutrient recovery and contaminant elimination. The demand segment has often been ignored as an area for future research, especially during the technology development. The findings from the few published articles on social acceptance show missing and inconclusive influence of demographic, sociological, and economic farmer-characteristics. This study endeavours to close this gap by using the social psychological theories, technology adoption theories and the new ecological paradigm to investigate the factors that influence the behavioral intentions of rural farmers to recycle human excreta in agriculture. Study findings show that social acceptance was driven by awareness, religiosity, income, source of income, and environmental dispositions. Perceived behavioral control represents a potential barrier to human excreta reuse. The study recommends the demographic, cultural, sociological, and economic mainstreaming of dissemination strategies of circular bioeconomy approaches within the context of agricultural innovation systems.

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“…The study used G*Power tools analysis to determine the appropriate number of subject in the study. For this research, researchers have set the alpha, power, and effect size values as α = 0.05, power = 0.80, and effect size = 0.50 based on Daly & Cohen, (1977) and Lipsey, (1990). Based on the G*Power analysis, the appropriate number of subjects for one group is 18 people or 36 people for both groups, thus 45 subjects for the study are suitable for this study.…”

Section: Discussionmentioning

confidence: 99%

A Randomized Controlled Trial of Contingency Management Therapy in Enhancing Treatment Engagement in a Drug Rehabilitation Centre

Ghani¹,

Amat²,

Rahimi³

et al. 2018

IJHSS

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Background and aims: Contingency management (CM) is a highly effective intervention and has been widely tested and evaluated in the context of substance abuse treatment worldwide. However, this approach is still new in developing countries such as Malaysia. This article aims at determining the effect of CM on treatment engagement within a psychosocial program in a compulsory treatment center in Malaysia. Methods: A randomized controlled trial design was used in this study. A total of 45 methamphetamine-dependent inmates were selected as subjects and randomly assigned into two groups namely the experimental group of treatment as usual + contingency management (TAU+CM) (n=22) and the controlled group of treatment as usual (TAU) (n=23). The TAU+CM group followed a 12-week CM intervention and 4-week follow up session without CM reinforcement. Meanwhile, the TAU group went through 16 weeks of usual psychosocial session implemented in the center. Measurements: The primary outcome of the study was treatment engagement within treatment sessions. It is measured by three parameters which are the assessment of (1) homework completion, (2) active participation and (3) understanding of treatment session. CM reinforcement in a form of star stickers with certain monetary value was given to subjects who achieved the targeted goal in the TAU+CM group. The value of the stickers started from RM2.00 and the magnitude would increase every four weeks. No reinforcement was given in the TAU group. Findings: The TAU+CM group seemed to enhance the treatment engagement within the 12-week psychosocial program. Overall, both groups have showed an increased treatment engagement with the TAU+CM group has a higher achievement than the TAU group. However, the overall differences between the groups were not statistically significant, thus rejecting the main hypothesis of the study which hypothesized that there will be significant differences in treatment engagement between the TAU+CM group and TAU group. Conclusion: The study of CM in a special population, especially in a compulsory treatment center, has been very challenging for researchers. Some studies had similar insignificant result could be due to the special population effect which needs to be further investigated in future studies.

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Statistical Power Analysis for the Behavioral Sciences, Revised Edition.

Cited by 110 publications

References 0 publications

Evaluation of early microstructural changes in the R6/1 mouse model of Huntington's disease by ultra-high field diffusion MR imaging

Evaluation of early microstructural changes in the R6/1 mouse model of Huntington's disease by ultra-high field diffusion MR imaging

Behavioral intentions of rural farmers to recycle human excreta in agriculture

A Randomized Controlled Trial of Contingency Management Therapy in Enhancing Treatment Engagement in a Drug Rehabilitation Centre

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