Description Usage Arguments Author(s) References Examples
Print alpha and its confidence interval.
1 2 |
object |
Results from the function |
prob |
Alpha level for confidence interval. |
... |
Option can be passed to the summary function. |
Zhiyong Zhang and Ke-Hai Yuan
Zhang, Z. & Yuan, K.-H. (2013). Robust Cronbach's alpha.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | data(holzinger)
spatial<-holzinger[, c('visual', 'cubes', 'paper', 'lozenge', 'paperrev','flagssub')]
verbal<-holzinger[, c('general', 'paragrap', 'sentence', 'wordc', 'wordm')]
speed<-holzinger[, c('add', 'code', 'counting', 'straight')]
memory<-holzinger[, c('wordr', 'numberr', 'figurer', 'object', 'numberf', 'figurew')]
alpha.spatial<-cronbach(spatial)
## diagnostic plot
plot(alpha.spatial, type='d')
## alpha with varphi=.01 & standard error
alpha.spatial<-cronbach(spatial, varphi=.01, se=TRUE)
## confidence interval
summary(alpha.spatial)
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