I'm a little bit confused with how exactly the 'cor' function handles missing values. Should the last two function calls give the same results? Thanks, ...Tao ==========================================
x=rnorm(10) y=rnorm(10) x[1]=NA y[2]=NA cor(x,y,method="spearman")
[1] -0.006060606
cor(x,y,use="pairwise.complete.obs",method="spearman")
[1] -0.006060606
cor(x[3:10],y[3:10],method="spearman")
[1] 0.1666667 ========================================== _________________________________________________________________ Create a Job Alert on MSN Careers and enter for a chance to win $1000! http://msn.careerbuilder.com/promo/kaday.htm?siteid=CBMSN_1K&sc_extcmp=JS_JASweep_MSNHotm2