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Block randomize a stimulus list with dplyr
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| library(dplyr) | |
| ## Toy data | |
| df <- data_frame(block=rep(1:3, each=4), item=rep(1:4,3), | |
| cond=rep(LETTERS[1:2], 6), | |
| stim=paste0(rep(letters[1:2],6), rep(1:6,each=2))) | |
| ## Randomize blocks and trials within blocks | |
| df.rand <- df %>% | |
| group_by(block) %>% | |
| mutate(item = sample(item)) %>% | |
| ungroup %>% | |
| mutate(block = rep(sample(1:3), each=4)) %>% | |
| arrange(block,item) |
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