Sentence examples for centred variables from inspiring English sources

Continuous variables were centred before interaction terms were created and only centred variables are included in the multivariate analyses.

Additionally, an interaction term between both variables was created by multiplying the centred variables.

Re-analysing this interaction model with centred variables or with a residualized interaction term would reduce multi-colinearity between the main predictors and the interaction predictor, but would not change the interpretation of the results (Wu and Zumbo, 2008).

Expectation Maximisation (EM) cluster analysis was applied to standardized (mean centred) variables: waist circumference, TG, HDL, systolic and diastolic blood pressure and fasting glucose, and was performed in STATISTICA (data analysis software system), version 8.0 (StatSoft, Inc. (2007) http://www.statsoft.com).statsoft.com

In contrast to analyses with the age variable in its original form, a statistically significant effect of age was found when centred variables were used.

We handled patient's age as a continuous variable and an on-average centred variable calculated for each patient by subtracting the mean age of the entire study population from the patient's age.

However, to test for moderation effects an interaction term was created from the mean-centred variables.

Age and health needs, as well as other patient-centred variables, have shown inconsistent correlation with PEI values [ 7, 10, 11].

Mean-centred variables and interaction terms were created and regressions run with the mean-centred variables entered at step 1, and interaction term at step 2. Recruitment and withdrawal data are shown in Figure  1, including two individuals who were later found to violate the inclusion criteria and thus were not included in analyses.

It might be argued that the lack of a fixed and coherent model is due to the relevance of unavoidable context issues in palliative care, such as specific cultural settings, patient-centred variables, and family specificity.

In the second step, the centred independent variables were added, and the centred moderating variables were then entered.