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The two thin lines represent the 95% confidence band and are based on a two sided t-statistic with Newey-West estimates of the standard errors.
The two thin lines represent the 95% confidence band and are based on a two sided t-statistic with Newey-West estimates of the standard errors Open image in new window Fig. 6 (a-d) Predicted conditional covariance subsamples.
A significance level of 0.05 (based on a two sided Wald test) was applied.
Sample size calculations were based on a two sided α error of 0.05 and 80% power.
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Based on a two-sided view (direct vs. polite), one hundred and twenty German upper secondary school students learned all about attribution theories while clicking through a learning web page where only instructional pages differed.
If a study were designed with 80% power to detect a true reduction in HCGI to 1.3 episodes/person-year from a level of 2.6 in the sham group, observation of 200 households (of approximatly three persons per household) would be required for one year of observation (based on a two-sided 0.05-level test adjusted for intrahousehold correlation [ρ=0.60]).
However, mean signed errors were not significantly different from each other, based on a two-sided t-test performed with the two sets of errors (95% confidence level, p-value = 0.139).
We tested for a difference between these two groups of practitioners based on a two-sided two-sample t-test and found no significant difference (P = 0.83).
The regression line slope was considered to be statistically different from zero at a cut-off of p≤0.05 based on a two-sided test.
In two comparison groups with two different cut-point splits: a) 0 versus at least 1 relapse during the sacrifice period, and b) 0 or 1 relapse versus at least 2 relapses during the sacrifice period, analysis was based on a two-sided log rank test to determine whether time to confirmed rise in EDSS is the same for two groups.
Fifty-four subjects will insure 80% power for detecting a population correlation coefficient of 0.3, based on a two-sided test with a 0.05 significance level.
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