Displaying 1 result from an estimated 1 matches for "dcbasmathcountspring".
2007 Sep 19
2
By() with method = spearman
...39;mtsc07', 'DCBASmathscoreSPRING')], tmp$Grade, cor,
use='complete', method='spearman')
Error in FUN(data[x, ], ...) : 'x' is empty
I can subset the data by grade and compute spearman rho as
tmp5 <- subset(tmp, Grade == 5)
cor(tmp5[,c('mtsc07', 'DCBASmathcountSPRING')], use='complete',
method='spearman')
But doing this iteratively is inefficient.
I don't see anything in the help man for by() or cor() that tells me
what the problem is. I might be missing it though. Any thoughts?
Thanks,
Harold
> sessionInfo()
R version 2.5.0 (200...