carroll2: Ticks acquired while walking or crawling

In kbroman/labstat: Statistics for Lab Scientists

Description

Numbers of ticks acquired while walking or crawling.

Usage

data(carroll2)

Format

A data frame with three columns: number of ticks and number of times (out of 50) that number was observed when walking and crawling.

Source

John F. Carroll, USDA

References

Carroll, J. F. and Kramer, M. (2001) Different activities and footwear influence exposure to host-seeking nymphs of Ixodes scapularis and Amblyomma americanum. J. Med. Entomol. 38, 596–600. (See Figure 1a.)

See Also

carroll1, carroll3

Examples

data(carroll2)
# barplot
barplot(as.numeric(t(carroll2[,-1])), space=c(0,0,rep(c(1,0),7)),
        col=rep(c("white","black"),3),ylab="Number of samples",
        xlab="Number of nymphs per sample",ylim=c(0,40),
        xlim=c(-0.5,23.5))
abline(h=0)
segments((0:7)*3+1,0,(0:7)*3+1,-1,xpd=TRUE)
text((0:7)*3+1,-2.8,as.character(0:7),xpd=TRUE)
legend(15.5,40,c("walking","crawling"),pch=15,cex=1.3,
       col=c("white","black"))
legend(15.5,40,c("",""),pch=0,bty="n",cex=1.3)

kbroman/labstat documentation built on Jan. 6, 2021, 4:51 a.m.