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Practical Geostatistics 2000
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Contact Isobel Clark with new errata or errors |
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We would like to thank everyone who provided feedback. |
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This page refers to the original 2000 printing and the first reprint (early 2001) |
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Second
reprint with all of these corrections came out September 2001.
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Errata from PG2000, Answers to the
Exercises click here |
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The most consistent spotter of typos in the first reprint has been Dr. Mahmut Cetin of
the Department of Agricultural Structures and
Irrigation at the |
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Thanks to Nick Cox of |
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I have not listed minor typos which do not interfere with the understanding of the text. These have been corrected in later editions. There are also stylistic idiosyncrasies which some readers/reviewers disagree with. Sorry but no change there.
1 2 3 4 5 6 7 8 9 10 11 12 Bibliography Tables Index
Table of Contents
Add subsection under Section 4.4 as follows:
4.4.1 mixtures of Normal or lognormal populations
Sections 7.3.3, 7.3.4 should read as follows:
7.3.3 Curvilinear Regression
7.3.4 Application - Polynomial Trend Surface Analysis
Section 9.3.1: Change "Geostatistic" to
"Geostatistics"
Preface
Replace 1980's and 1990's by 1980s and 1990s.
Notation
f a secondary or ancillary variable measured on a sample (not
samples)
Chapter 1 Introduction
second sentence: "This text is based in 28 years of courses"
should read "This text is based on 28 years of courses".
Chapter 2 Why a statistical approach?
Pages 16, 17 (& other pages): The skewness and kurtosis calculations in
the text divide by "n" to match the approach in this chapter. Our
software (e.g., Figure 2.2) uses the more common statistical version and
divides by "n - 1". It makes no practical difference.
Page 17, Figure 2.2 (& other figures): the horizontal axis labeling for the cells is a value such that all the values
in that cell are less than or equal to it. This can be a little confusing when
there is only 1 observation in the cell. For example, the first cell has only
the value 19.92 in it. Thus the labeling 19.92 at the
right hand side of the cell implies that all the values in this cell (just one
in this case) are less than or equal to 19.92. Since the only value in this
cell is 19.92, the labeling is consistent with this
approach; however, at a quick glance, one might mistakenly interpret that there
might be values less than 19.92.
Page 21, second sentence in section 2.8.3: "These data comprise a set of
water wells in the Texas Panhandle area of the USA."
At the bottom of page 21, we say "The skewness is positive because the
data is skewed to the lower values". This might be less ambiguous if
phrased as follows: "The value for the skewness is positive because the
majority of the samples have lower values." The expression of skewness as
positive or negative seems to be a field of much contention. According to our
mathematical definition of skewness, the statistic will take a positive value
if the majority of samples are low and there is a long tail into the high
values. The skewness statistic is negative if the majority of values are
clumped into high values with a long tail into the low values. When we refer to
positive or negative skewness we are simply referring to the numerical values
obtained in the calculation.
Chapter 3 Normal distributions
Pages 51, 56, 60, 64, Worked examples 3.6.1, 3.6.2, 3.6.3, 3.6.4, estimation
of standard deviation section: Table 4 should be changed to Table 3.
Pages 52, 57, 61, 65, Worked examples 3.6.1, 3.6.2, 3.6.3, 3.6.4, estimation
of the mean section: Table 3 should be changed to Table 4.
Page 56, Worked example 3.6.2, estimation of standard deviation section:
change "standard deviation of the calorific values" to "standard
deviation of the %Fe values".
Page 60, Worked example 3.6.3, estimation of standard deviation section:
change "standard deviation of the calorific values" to "standard
deviation of the potentiometric values".
Page 64, Worked example 3.6.4, estimation of standard deviation section:
change "standard deviation of the calorific values" to "standard
deviation of the scallop catch values".
Page 64, after line "substituting for n
and rearranging a little:" second line of mathematics is missing the
"Ï 2c @ " from
between <
Ï (2 x 147 - 1) - 1.6449 < Ï 2c @ < Ï (2 x 147 - 1) + 1.6449
Ï 293 - 1.6449 < Ï 2c @ < Ï 293 + 1.6449
15.47 < Ï 2c @ < 18.76
Page 65, estimation of the mean section, 4th line: change this line to read "the Student's t value of 1.6449, so that:"
Chapter 4 Lognormal distributions (and others)
Page 70, third paragraph, fourth sentence: Change to "Or you can buy
(or plot) logarithmic probability paper."
Page 74, start of first full paragraph on page: Change "To simply" to
"To simplify".
Page 74, table in middle, row with V = 0.50: we copied the wrong line from
Table 7 and all values in this line should be 1.281. The line below with V =
0.4391should have 1.2438 in the column labeled n =
27. In the equation following this table, change 1.2690 ro
1.2438. In this same equation, change 67.038 to 65.709.
Page 75, top line: Change "8(g)" to "8(e)".
Page 75, 1st equation below tables: Change "67.038" to
"65.709" and "54.589" to "53.507".
Page 75, 2nd equation below tables: Change "67.038" to
"65.709" and "89.831" to "88.050".
Page 75, 2nd line below two equations: Change "54.6" to
"53.5" and "89.8" to "88.0".
Page 81, last line: Change "67.038" to "65.709".
Page 86, Section 4.4.1, last sentence of first paragraph: Change "example
is given in Case Studies Chapter 14." to
"treatment is discussed in Chapter 12."
Chapter 5 Discrete distributions
Page 103, second paragraph, third line: Change "know" to
"known".
Page 114: Change "Sichel (reference 2 of his papers)" to Sichel
(1973).
Page 117, Change Sichel (1971b) to Sichel (1971)
Page 116: Change Griffith to Griffiths
Page 117: Change Griffith to Griffiths. Change Griffith's to Griffiths'
Page 132, exercise 13, 5th line in problem: change "loss" to
"lose".
Page 138, second paragraph: "the ratio of the two variances " not
"the ratio of two standard deviations"
Chapter 7 Relationships
Page 150, first paragraph: "second and fourth quadrants give a
negative number" not "a positive number"!
Page 165, end of paragraph below figure: Change "Chapter 11." to
"Chapter 12."
Page 165, second and third paragraphs below figure: Change "Figure
7.6" to "Figure 7.8".
Page 171, immediately under analysis of variance table: Change "Table
6(b)" to "Table 5(b)".
Page 173, elevation equation near bottom: subscript should be "0"
instead of "o" on first term on right hand side.
Page 179, Analysis of variance table: there should be 5 instead of 6 degrees of
freedom for the quadratic trend. This change should also be made in the
(extracted) table on Page 181.
Page 181, fifth line: Change "Table 6(b)" to "Table 5(b)".
Page 182, last paragraph before Exercises in Section 7.4
References to Figures 7.11, 7.12 and 7.13 should be Figures 7.13, 7.14, 7.15.
Page 183, Exercise 5, first word: Change "Analysis" to
"Analyse".
Chapter 8 The spatial element
Page 195, first line under equation: Change "Chapter 2" to "Chapter
3".
Page 195, last sentence in item 8: Delete "A basic introduction to
geostatistical simulation is discussed in Chapter 13."
Simulation and other goodies will be in Volume 2. Let us know what you would
like to see in Volume 2.
Page 205, additional Exercises on this page should begin with 5 and not restart
with 1.
Page 207, 4th line from bottom is missing a period after the word
"samples". It should read "... every pair of samples. Our
problem is".
Chapter 9 The semi-variogram
Page 208, 8th line below Figure 9.1: change "quit" to
"quite".
Page 219, 220: this is not a typo, but a word of caution. The exponential and
Gaussian semi-variogram formulas in our book follow geostatistical tradition. A
small percentage of the more recent books use a different (& more confusing
in our opinion) definition of the "a" in this formulas. "a"
as used in formulas in a few books is not the standard "a" but
something that has been creeping into the literature under the name of either
"effective range" (Deutsch, Journel, 1998,
page 25) or "practical range" (Goovaerts,
1997, page 88) while other books (Cressie, 1993 page 61,or Armstrong, 1998,
pages 37, 38) stay with the standard definition of "a". The new
"a" is the point where it hits 95% of its asymptotic value. Why it
was necessary to add undue confusion to the well defined semi-variograms is not
clear to us. We have stayed with the standard formulas (also as found in the
Clark 1979 original "Practical Geostatistics").
Page 224, 12th line of Section 9.2.10 is missing a space after
"sample". It should read "... size of a nugget and one sample is
inside...".
Page 229, top line: change "Aso" to
"Also".
Page 235, 3rd line: change "Figures 14 and 15" to "Figures 9.14
and 9.15".
Page 237, tenth printed line: Change "tables 5(A)" to "tables
5(a)".
The figure label "Figure 9.15" is mistakenly given to two figures. It
should be obvious from the text which figure is being referenced. The second
printing will renumber the figures so that the second Figure 9-15 and all
subsequent figures are incremented by 1.
Chapter 10 Estimation and Kriging
Page 247, 2nd line below summation of weights, wi
adding to 1: Change "This are" to "These are".
Page 250, last line has two typos [g2 should be w2, and we
should be w3] so that
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T* = |
w1g1 + w2g2 + w3g3 + w4g4 + w5g5 |
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= |
21.86w1 + 25.62w2 + 25.61w3 + 26.80w4 + 23.76w5 |
Page 256, 2nd line below first set of equations: Change "try it on a
spreadsheet" to "Try it on a spreadsheet".
Page 260, 2nd line below first equation: Change "sample 1 and T, sample 3
and T minus the variogram" to "sample 1 and T; sample 3 and T; minus
the variogram".
Page 265, the last line of the estimation variance equation mistakenly
has w3 in place of w1 and w2 and this equation
should read as given below:
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se2= |
2w1g(g1,T) + 2w2g(g2,T) + 2w3g(g3,T) +.................+2 wmg(gm,T) |
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- {w12g(g1,g1) + w1w2g(g1,g2) +w1w3g(g1,g3) +.................+ w1wmg(g1,gm) + w2w1g(g2,g1) + w22g(g2,g2) +w2w3g(g2,g3) +.................+ w2wmg(g2,gm) + w3w1g(g3,g1) + w3w2g(g3,g2) +w32g(g3,g3) +.................+ w3wmg(g3,gm) ................ ................ ................. + wmw1g(gm,g1) + wmw2g(gm,g2) +wmw3g(gm,g3) +.................+ wm2g(gm,gm) } |
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- g(T,T) |
Page 269, top line: Change 0.556 to 0.0556.
Page 272, last equation needs same change as given above for page 265.
Page 275, top equation, last equation needs same change as given above for page
265.
Page 279, typo (missing terms " + (-0.3757) - 0.0") in estimation
variance equation for ordinary kriging. Corrected equation is:
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sok 2= |
w1g(g1,T) + w2g(g2,T) + w3g(g3,T) + w4g(g4,T) + w5g(g5,T) + l - g(T,T) |
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= |
0.2505 x 1.2953 + 0.0841 x 1.2953 + 0.2907 x 0.8399 + 0.2907 x 0.8399 + 0.0841 x 1.2953 + (- 0.3757) - 0.0 |
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= |
0.6549 |
Chapter 11 Areas and volumes
Page 302, penultimate (next to last!) line: Change "difference"
to "differences".
Page 322, figure for proportional effect: vertical axis should read
"standard deviation with block"
Chapter 12 Other kriging approaches
Page 334: "multiplying the actual rank by 100/(n+1)" not "(n-1)"
Bibliography
Add the following reference:
Griffiths, J.C., 1960, Frequency distributions in accessory mineral analysis,
J. Geol., 68, 353.
Tables
Yes, we know there are no page numbers after page 342. It's a long story...
Table 15: heading row for L should read ".1 .2 .3 .4 .5 .6 .7 .8 .9 1.0"
Index
"on regression" under "confidence interval":
Change 160 to 156.
mean: change last page number from 75 to 73.
median: change last page number from 74 to 73.
mode: change last page number from 75 to 73.
"proportional effect" is missing an i.