[adsense:responsibe:9545213979]
x1<- c(rep(15,4),rep(20,3),rep(25,1),rep(15,1),rep(20,4),rep(25,7)); y1<- c(rep(5,4),rep(5,3),rep(5,1),rep(10,1),rep(10,4),rep(10,7)); x2<- (x1-15)/5; y2<- (y1-5)/5; ni<- table(x1); n<-sum(ni);
vx1 <-var(x1)*(n-1)/n vx1 [1] 15.6875 vy1 <-var(y1)*(n-1)/n vy1 [1] 6 vx2 <-var(x2)*(n-1)/n vx2 [1] 0.6275 vy2 <-var(y2)*(n-1)/n vy2 [1] 0.24 vy2*5^2 [1] 6 vx2*5^2 [1] 15.6875
x1 := Join[ConstantArray[15,4],ConstantArray[20,3], ConstantArray[25,1],ConstantArray[15,1],ConstantArray[20,4], ConstantArray[25,7]]; y1 := Join[ConstantArray[5,4],ConstantArray[5,3], ConstantArray[5,1],ConstantArray[10,1],ConstantArray[10,4], ConstantArray[15,7]];
x2:=(x1-15)/5; y2:=(y1-5)/5; ni := Tally [x1]; n := Sum[ni[[i, 2]], {i, Length[ni]}]; vx1:=(Variance[x1] (n - 1))/n; vx2:=(Variance[x2] (n - 1))/n; vy1:=(Variance[y1] (n - 1))/n; vy2:=(Variance[y2] (n - 1))/n; N[vx1] N[vx2] N[vy1] N[vy2] N[vx2 5^2] N[vy2 5^2] 15.6875 0.6275 18.6875 0.7475 15.6875 18.6875
Comentarios recientes