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Analysis of Variance


Model II - example


,v


13309


-L


XJ

Step 1 - Preliminary computations


host 1

host 2

host 3

6»*4

5/

2978

3544

4619

2168

13 30*

■i

8

10

13

6

i

Y,

372.25

354.40

355.31

361.33

359.70

£(y,-v,)-

379.50

1278.4

954.77

1165.3

3778.0 r-t-4_

"7^


Width (in |im) of scutum (dorsal shield) of larvae of the tick Haemaphysa/is łeporispalustristn samples from 4 cottontail rabbits

Source: Sokat and RoMf, Bomelry


host 1

Kost 2

Kost 3

Kost 4

3*0

350

354

376

376

356

360

344

360

358

362

342

368

376

352

372

372

338

366

374

366

342

372

360

374

366

362

382

350

344

344

342

364

358

353

348

348


Step 2 - Sum of squares


SS, , sum of squares among groups =


8(372.25 - 359.7)2 +10(354.4 - 359.7)2 +... + 13(355.31 -3S9.7)2 +6(361.33-359.7)2 =

1807.73


Step 2 - Sum of squares

| Step 2 - Sum of squares

SS^,^, sum of squares within groups =

"T

SSlouU, total sum of squares =

±±(\-xf-

i-i j-i

1807.73 + 3778.0 = 5585.73

379.50 + 1278.40 + 954.77 +1165.33 = 3778.0



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