Displaying 2 results from an estimated 2 matches for "distractor".
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distractors
2009 Jan 22
1
melt stumbles over deleted columns
...deleted the variable column and tried to melt the resulting data frame.
Depending on which method I use to delete the column I get different
error messages when melting:
> head(tinfos)
vpn group trial_no item relation trial_type rt variable #
1 102 2 1 4351 diag1 distractor 8471 fix_d 27
2 102 2 2 1214 id target 4072 fix_d 17
3 102 2 3 4213 diag1 distractor 7040 fix_d 27
4 102 2 4 1314 id target 4370 fix_d 15
5 102 2 5 2655 vert distractor 4397 fix_d 17
6 102...
2012 Feb 19
3
Non-parametric test for repeated measures and post-hoc single comparisons in R?
Some attribute x from 17 individuals was recorded repeatedly on 6 time
points using a Likert scale with 7 distractors. Which statistical
test(s) can I apply to check whether the changes along the 6 time points
were significant?
set.seed( 123 )
x <- matrix( sample( 1:7, 17*6, repl=T ),
nrow = 17, byrow = TRUE,
dimnames = list(1:17, paste( 'T', 1:6, sep='' ))
)
I found the Friedman test...