grepl("senate", c(NA, "senate"))  FALSE TRUE str_detect(c(NA, "senate"), fixed("senate", ignore_case=T))  NA TRUE
vignettes about knitr
When building package vignettes, use
rmarkdown changes all words with http:// to links, unless of course you want that to happen.
object.size(as.factor(c(rep("1",1000), rep("2", 1000)))) 8512 bytes object.size(c(rep("1",1000), rep("2", 1000))) 16136 bytes
Rprofile Customizations from RScript
To access customizations in RProfile with RScript, source .Rprofile within the R script
Missing weights, weighted.mean
There are instances where sampling weights are not only unknown, but in fact, cannot be known (unless one makes certain unsavory assumptions). Under those circumstances, weights for certain respondents can be ‘missing’. Typically there the strategy is to code those weights as 0. However if you retain those as NA, weighted.mean etc. is wont to give you NA as an answer, even if you set na.rm=T.
To get non-NA answers, set NAs to zero or estimate mean over respondents with non-missing weights.
Find more here.