A robust<i>I</i>-sample analysis of means type randomization test for variances for unbalanced designs

Wludyka, Peter; Sa, Ping

doi:10.1080/00949650310001640138

Cited by 12 publications

(6 citation statements)

References 9 publications

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“…The use of analysis of variance (ANOVA) models was deemed not valid, as assumptions were not met for the homogeneity of variance for the dependent variables (P \ .05). 46,47 As such, dependent variables were compared using 2-tailed paired t tests for both groups. Bonferroni corrections were performed to account for 3 comparisons made for each dependent variable across the velocities used, with significance adjusted to P \ .0167.…”

Section: Discussionmentioning

confidence: 99%

Rate of Torque and Electromyographic Development During Anticipated Eccentric Contraction Is Lower in Previously Strained Hamstrings

et al. 2012

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Previously injured hamstrings displayed lower RTD and IMP during slow maximal eccentric contraction compared with the contralateral uninjured limb. Lower myoelectrical activity was confined to the biceps femoris long head. Regardless of whether these deficits are the cause of or the result of injury, these findings could have important implications for hamstring strain injury and reinjury. Particularly, given the importance of high levels of muscle activity to bring about specific muscular adaptations, lower levels of myoelectrical activity may limit the adaptive response to rehabilitation interventions and suggest that greater attention be given to neural function of the knee flexors after hamstring strain injury.

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Section: Discussionmentioning

confidence: 99%

Rate of Torque and Electromyographic Development During Anticipated Eccentric Contraction Is Lower in Previously Strained Hamstrings

et al. 2012

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“…Results obtained by the method of Wludyka and Sa (38) indicated that the standard deviation of the sponge-rubbing method, compared with that of the other methods, was significantly smaller in two evaluation groups (colifonns from cantaloupe and E. faecalis from jalapeno). hi contrast, the Brown-Forsythe homogeneity of variance test suggested that there was no significant difference in standard deviations among the methods for colifonns from cantaloupe (P = 0.0663).…”

Section: Resultsmentioning

confidence: 87%

Validation of a Novel Rinse and Filtration Method for Efficient Processing of Fresh Produce Samples for Microbiological Indicator Enumeration

Heredia

Solís-Soto

Venegas

et al. 2015

Journal of Food Protection

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Several methods have been described to prepare fresh produce samples for microbiological analysis, each with its own advantages and disadvantages. The aim of this study was to compare the performance of a novel combined rinse and membrane filtration method to two alternative sample preparation methods for the quantification of indicator microorganisms from fresh produce. Decontaminated cantaloupe melons and jalapeño peppers were surface inoculated with a cocktail containing 10(6) CFU/ml Escherichia coli, Salmonella Typhimurium, and Enterococcus faecalis. Samples were processed using a rinse and filtration method, homogenization by stomacher, or a sponge-rubbing method, followed by quantification of bacterial load using culture methods. Recovery efficiencies of the three methods were compared. On inoculated cantaloupes, the rinse and filtration method had higher recovery of coliforms (0.95 log CFU/ml higher recovery, P = 0.0193) than the sponge-rubbing method. Similarly, on inoculated jalapeños, the rinse and filtration method had higher recovery for coliforms (0.84 log CFU/ml higher, P = 0.0130) and E. coli (1.46 log CFU/ml higher, P < 0.0001) than the sponge-rubbing method. For jalapeños, the rinse and filtration method outperformed the homogenization method for all three indicators (0.79 to 1.71 log CFU/ml higher, P values ranging from 0.0075 to 0.0002). The precision of the three methods was also compared. The precision of the rinse and filtration method was similar to that of the other methods for recovery of two of three indicators from cantaloupe (E. coli P = 0.7685, E. faecalis P = 0.1545) and was more precise for recovery of two of three indicators from jalapeño (coliforms P = 0.0026, E. coli P = 0.0243). Overall, the rinse and filtration method performed equivalent to, and sometimes better than, either of the compared methods. The rinse and filtration method may have logistical advantages when processing large numbers of samples, improving sampling efficiency and facilitating microbial detection.

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“…The complete details of the method can be found in Wludyka and Sa. 14 Groups exceeding the computed decision limits were concluded to have variances statistically different from the square root of the average group variance. To further confirm the heterogeneity of variance, a Bartlett test was performed to test that the variances were equal.…”

Section: Methodsmentioning

confidence: 99%

Rigorous anaesthesia management protocol for patients with intracranial arterial stenosis: a prospective controlled-cohort study

et al. 2016

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ObjectivesReducing variability is integral in quality management. As part of the ongoing Encephaloduroarteriosynangiosis Revascularisation for Symptomatic Intracranial Arterial Stenosis (ERSIAS) trial, we developed a strict anaesthesia protocol to minimise fluctuations in patient parameters affecting cerebral perfusion. We hypothesise that this protocol reduces the intraoperative variability of targeted monitored parameters compared to standard management.DesignProspective cohort study of patients undergoing encephaloduroarteriosynangiosis surgery versus standard neurovascular interventions. Patients with ERSIAS had strict perioperative management that included normocapnia and intentional hypertension. Control patients received regular anaesthetic standard of care. Minute-by-minute intraoperative vitals were electronically collected. Heterogeneity of variance tests were used to compare variance across groups. Mixed-model regression analysis was performed to establish the effects of treatment group on the monitored parameters.SettingTertiary care centre.Participants24 participants: 12 cases (53.8 years±16.7 years; 10 females) and 12 controls (51.3 years±15.2 years; 10 females). Adults aged 30–80 years, with transient ischaemic attack or non-disabling stroke (modified Rankin Scale <3) attributed to 70–99% intracranial stenosis of the carotid or middle cerebral artery, were considered for enrolment. Controls were matched according to age, gender and history of neurovascular intervention.Main outcome measuresVariability of heart rate, mean arterial blood pressure (MAP), systolic blood pressure and end tidal CO2 (ETCO2) throughout surgical duration.ResultsThere were significant reductions in the intraoperative MAP SD (4.26 vs 10.23 mm Hg; p=0.007) and ETCO2 SD (0.94 vs 1.26 mm Hg; p=0.05) between the ERSIAS and control groups. Median MAP and ETCO2 in the ERSIAS group were higher (98 mm Hg, IQR 23 vs 75 mm Hg, IQR 15; p<0.001, and 38 mm Hg, IQR 4 vs 32 mm Hg, IQR 3; p<0.001, respectively).ConclusionsThe ERSIAS anaesthesia protocol successfully reduced intraoperative fluctuations of MAP and ETCO2. The protocol also achieved normocarbia and the intended hypertension.Trial registration numberNCT01819597; Pre-results.

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A robustI-sample analysis of means type randomization test for variances for unbalanced designs

Cited by 12 publications

References 9 publications

Rate of Torque and Electromyographic Development During Anticipated Eccentric Contraction Is Lower in Previously Strained Hamstrings

Rate of Torque and Electromyographic Development During Anticipated Eccentric Contraction Is Lower in Previously Strained Hamstrings

Validation of a Novel Rinse and Filtration Method for Efficient Processing of Fresh Produce Samples for Microbiological Indicator Enumeration

Rigorous anaesthesia management protocol for patients with intracranial arterial stenosis: a prospective controlled-cohort study

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