How do you interpret a significant covariate?
These are the p-values that are interpreted. Look first at the row denoting the covariate variable. If the p-value is LESS THAN . 05, then the covariate significantly adjusts the association between the predictor and outcome variable.
Can you have two covariates in an ANCOVA?
Thus the ANCOVA tests whether the independent variables still influence the dependent variable after the influence of the covariate(s) has been removed. The factorial ANCOVA includes more than one independent variable and the factorial ANCOVA can include more than one covariate, SPSS handles up to ten.
What does a significant interaction between the predictor and the covariate tell you?
If there is a statistically significant interaction effect, this indicates that the effect that one independent variable has on the dependent variable depends on the level of the other independent variable, after controlling for the continuous covariate(s).
What if Levene’s test is significant in ANCOVA?
Levene’s test is significant, indicating that the group variances are not equal (hence the assumption of homogeneity of variance is likley been violated).
What does a significant intercept mean in ANCOVA?
Income ~ Sex. Then if sex is coded as 0 for men and 1 for women, the intercept is the predicted value of income for men; if it is significant, it means that income for men is significantly different from 0.
What does it mean when an interaction is not significant?
When there is no Significance interaction it means there is no moderation or that moderator does not play any interaction on the variables in question.
How do you interpret a non significant interaction ANOVA?
If the p-value is greater than the significance level you selected, the effect is not statistically significant. If the p-value is less than or equal to the significance level you selected, then the effect for the term is statistically significant.
Is it bad if Levene’s test is significant?
The literature across the internet says that if Levene’s Test is significant, then ANOVA and Post Hoc should not be applied. The data seems normal according to Kolmogorov-Smirnov and Shapiro-Wilk normality test. Both show the insignificant value for these tests.
What makes a Levene’s test significant?
However, Levene’s test is statistically significant because its p < 0.05: we reject its null hypothesis of equal population variances.
How do you interpret a significant intercept?
When X never equals 0, but you want a meaningful intercept, simply consider centering X. If you re-scale X so that the mean or some other meaningful value = 0 (just subtract a constant from X), now the intercept has a meaning. It’s the mean value of Y at the chosen value of X.
What does it mean to have a significant intercept?
So, suppose you have a model such as. Income ~ Sex. Then if sex is coded as 0 for men and 1 for women, the intercept is the predicted value of income for men; if it is significant, it means that income for men is significantly different from 0.
What does ANCOVA tell us?
ANCOVA. Analysis of covariance is used to test the main and interaction effects of categorical variables on a continuous dependent variable, controlling for the effects of selected other continuous variables, which co-vary with the dependent.
What does it mean when an interaction is significant?
A significant two-way interaction means that the effect of one factor depends on the level of another factor, and vice versa. For example, suppose that a researcher is interested in studying the effect of a new medication. To do so, she compares the effects of both the medication and a placebo over time.
What does a significant interaction in ANOVA mean?
It just means that for the main effect in question, that variable’s effect entirely depends on the value of the other variable in the interaction term. None of that variable’s effect is independent of that other variable.
What does significant interaction mean?
What does it mean when an interaction is not statistically significant?
What happens if Levene’s test is significant in Ancova?
What does it mean if Levenes test is significant?
If the Levene’s Test is significant (the value under “Sig.” is less than . 05), the two variances are significantly different. If it is not significant (Sig. is greater than . 05), the two variances are not significantly different; that is, the two variances are approximately equal.