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It allows unbiased estimation of main effects with smallest possible variance of components [23, 25].
W is an index that measures the ratio of the observed variance of the sum of ranks to the maximum possible variance of sum of ranks.
The extracted components have the following features: (1) the first component will explain the highest possible variance of all determined components, (2) the successive components will explain the variance that the previous components did not explain, and (3) variables loaded in each component are linearly independent to the ones loaded in the remaining components.
PCA is a linear orthogonal transformation of the variables in Y to principal components in such a way that the first component has the largest possible variance; the second component has the largest possible variance of the remaining data, etc., with the total p components explaining 100% of the variance.
The R2 for the model was 0.123, suggesting that these combined factors account for 12% of possible variance of factors that may impact treatment satisfaction.
Samples collected through central venous catheter and samples collected through peripheral vein puncture were excluded from the study to eliminate the possible variance of blood levels of biomarkers between arterial blood and venous blood.
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In this context, the best predictor is the predictor that partitions the data in a way that each of the resulting nodes has the minimum possible variance in the values of the target variable.
Based on power calculations with a range of possible variance, we will perform the experiment three times for a final estimated power of at least 82.2%.
However, since the entire distribution of possible variance reductions has been computed one could also consider incorporating information regarding the accuracy of this estimate into the selection process.
Moreover for forecasts of future height development, it seems advantageous to describe the highest possible variance partition as a function of dynamic (i.e. time-varying) covariates through their fixed effects, because it can be assumed that the information from measured dbh-height pairs becomes less meaningful with increasing simulation period.
The influence of other factors on the pain threshold did not exceed 25% of the possible variance.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com