By Cao H. D., Chow B., Chu S. C., Yau S. T. (eds.)

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Practical considerations concerning the efficiency of stereological procedures can be found in Gundersen & Østerby (1981). An interesting biological example of volume estimation using magnetic resonance imaging is described in Roberts et al. (1993). The invention of vertical designs by Baddeley (1983, 1984) has had a major importance in practice. 14 can be replaced by a cycloid test system, cf. Baddeley et al. (1986). Vertical designs have also been developed in local stereology. A dual model-based approach has earlier been studied, cf.

INTRODUCTION TO STEREOLOGY ij = 1,.. ,7V. Show that Var(tf) = : É ^ £ > , ■ - * ' . Hint. It is a good idea to start by finding the second-order sampling probabilities. 2. Show that Var(7V)>^^7V-iV2. 3. e. - N2. Var(iV) = ^ p - N Show under this assumption that | 5 | ~ b(l,p) w tn i parameter p = Nh/L(7ri0X). 4. 5, a planar section with N — 15 particles is shown. e. the number of particles first seen in window i. Find the distribution of N and show that EN = 15. 5. This exercise concerns the 1-dimensional analogue of the spatial point grid design.

A j . In particular, Df(X{... xj) does not depend on ( x i , . . , rr^). We can now use the coarea formula with D = X = Rd and Y = Fj. ,xd)} = 1. 4) now becomes I h(f{x))dxd = I h(y)dyd. By using h(y) = l{y e A}, we find Xd(Af) = Xi(A). 3. This result will be important in the coming chapters» especially in Chapter 4. 8 below. 6. 8. 8. r^x/Wxl S"" 1 46 2. THE COAREA FORMULA Then, for any non-negative function g on Rn, f g{x)\\x\f{n~1)dxn = f f g{x)dx1dujn-\ Proof. We want to find the Jacobian of the mapping / .