The smd() function provides various standardized mean effect sizes for
single-case data.
smd(data, dvar, pvar, mvar, phases = c(1, 2))A single-case data frame. See scdf() to learn about this
format.
Character string with the name of the dependent variable. Defaults to the attributes in the scdf file.
Character string with the name of the phase variable. Defaults to the attributes in the scdf file.
Character string with the name of the measurement time variable. Defaults to the attributes in the scdf file.
A vector of two characters or numbers indicating the two phases
that should be compared. E.g., phases = c("A","C") or phases = c(2,4)
for comparing the second to the fourth phase. Phases could be combined by
providing a list with two elements. E.g., phases = list(A = c(1,3), B = c(2,4)) will compare phases 1 and 3 (as A) against 2 and 4 (as B). Default
is phases = c(1,2).
Juergen Wilbert
'sd cohen' is the (unweigted) average of the variance of phase A and B. 'sd Hedges' is the weighted average of the variance of phase A and B (with a degrees of freedom correction). 'Hedges' g' is the mean difference divided by 'sd Hedges'. 'Hedges' g correction' and 'Hedges' g durlak correction' are two approaches of correcting Hedges' g for small sample sizes. 'Glass' delta' is the mean difference divided by the standard deviation of the A-phase. 'Cohens d' is the mean difference divided by 'sd cohen'.
overlap(), describe()