median median absolute deviation mad % relative median absolute deviation %rmad = mad / median x 100

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Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

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Page 1: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

Median

Median Absolute DeviationMAD

% Relative Median Absolute Deviation%RMAD = MAD / median x 100

Page 2: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

Intralaboratory precision

Interlaboratory precision

Within

Between

Page 3: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

ICP vs colorimetry to analyze P

Calculated CEC

Salt pH

Combustion C and CaCO3

Nitrate analysis

Scooping versus weighing

Hot-water and Mehlich-3 B

Micropipette method for soil texture

Page 4: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

ICP vs colorimetry to analyze P

Page 5: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0

10

20

30

40

50

60

70

80

90

0 10 20 30 40 50 60 70

colorimetric-P, mg/kg

ICP

-P, m

g/k

g

ICP vs colorimetric P

ICP labs = 39

colorimetric labs = 21

Page 6: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0 10 20 30 40 50 60 7005

1015202530354045

colorimetric ICP

P conc, mg/kg

%RM

AD (M

AD/M

ED x

100

)

ICP vs colorimetric P

Page 7: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0

2

4

6

8

10

12

0 2 4 6 8 10 12

colorimetric-P MAD, mg/kg

ICP

-P M

AD

, mg

/kg

ICP vs colorimetric P

Page 8: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

Calculated CEC

Page 9: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

1 M NH4OAcCEC at pH 7 = sum of bases + acidity

Calculated CEC

?

Page 10: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

4 5 6 7 8 9-5

0

5

10

15

20

25

30

35

1:1 soil pH

M3

Ca -

Am

mA

cc C

a

4 5 6 7 8 9-1

0

1

2

3

4

5

6

7

1:1 soil pH

M3

Mg

- Am

mA

cc M

g

4 5 6 7 8 9-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

1:1 soil pH

M3

K - A

mm

Acc

K

Ca Mg K

Page 11: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

4 5 6 7 8 9-10

-5

0

5

10

15

20

25

1:1 soil pH

calc

CEC

- Am

m A

ceta

te C

EC

Page 12: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0 5 10 15 20 25 30 35 400

10

20

30

40

f(x) = NaN x + NaNR² = 0 Northeastern Region Methods Manual

NAPT NH4OAc CEC median +- MAD, meq/100g

Calc

CEC

, meq

/100

g

1:1 line

Exchangeable acidity =12.6 – (1.64 x soil pH) – (0.48 SMP buffer pH)

Page 13: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0 5 10 15 20 25 30 35 400

10

20

30

40

f(x) = NaN x + NaNR² = 0 Northcentral Region Methods Manual

NAPT NH4OAc CEC median +- MAD, meq/100g

Calc

CEC

, meq

/100

g

1:1 line

Exchangeable acidity =12 x (7 – SMP buffer pH)

Page 14: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0 5 10 15 20 25 30 35 400

10

20

30

40

f(x) = NaN x + NaNR² = 0 Current calculation at Univ. Kentucky

NAPT NH4OAc CEC median +- MAD, meq/100g

Calc

CEC

, meq

/100

g

1:1 line

Acidity =8 x (7.5 – SMP buffer pH)

Page 15: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0 5 10 15 20 25 30 35 400

10

20

30

40

f(x) = NaN x + NaNR² = 0 Using 1 M KCl soil pH &

Sikora-2 soil-buffer pH

NAPT NH4OAc CEC median +- MAD, meq/100g

Calc

CEC

, meq

/100

g

1:1 line

Page 16: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

Salt pH

Page 17: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

4 5 6 7 8 93

4

5

6

7

8

9

soil water pH

0.01

M C

aCl2

soi

l pH

1:1 line

Page 18: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0.0 0.5 1.0 1.5 2.0 2.5 3.00.0

0.2

0.4

0.6

0.8

1.0

1.2

1:1 EC, dS/m

soil

wat

er p

H -

0.01

M C

aCl2

pH

Page 19: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

Nitrate analysis

Page 20: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0 10 20 30 40 50 60 70 800

10

20

30

40

50

60

70

80Ion selective electrode

nitrate reduction

NO3-N conc., mg/kg

%RM

AD (M

AD/M

ED x

100

)

criti

cal v

alue

Page 21: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

Combustion C and CaCO3

Page 22: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

4 5 6 7 8 9 100.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

1:1 soil pH

% C

from

CaC

O3

Page 23: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

4 5 6 7 8 9 100.001

0.01

0.1

1

10

1:1 soil pH

% C

from

CaC

O3

Page 24: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

Scooping versus weighing

Page 25: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0 10 20 30 40 50 60 70 80 90 1000.6

0.8

1

1.2

1.4

1.6

1.8

2

f(x) = 0.00590390922708225 x + 0.975504432009451R² = 0.466092123713754

% sand

soil

dens

ity, g

/cm

3

M3 assumes 1.18 g / cm3

M1 assumes 1.25 g / cm3

Page 26: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

% sand% OM

g / cm3g / cm3

Page 27: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0 10 20 30 40 50 60 70 80 90 1000.6

0.8

1

1.2

1.4

1.6

1.8

2

% sand

soil

dens

ity, g

/cm

3

M3 assumes 1.18 g / cm3

+ 40%

- 40%

Page 28: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0 10 20 30 40 50 60 70 80 90 10010

15

20

25

30

35

40

45

50

55

assume 3 mg/L in M3 extract

% sand

Meh

lich

3 P,

mg/

kg

1.7 cm3 scoop & 1.18 g / cm3

Page 29: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

Hot-water and Mehlich-3 B

Page 30: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.60

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

Mehlich B, mg/kg

Hot

wat

er B

, mg/

kg

Page 31: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.60

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

Mehlich B, mg/kg

Hot

wat

er B

, mg/

kg

2 g 20 mL

10 g 20 mL

Limit of quantification = 0.05 mg/L

Page 32: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.60

10

20

30

40

50

60

70

80

90

Mehlich-3Hot water

B, mg/kg

%RM

AD (M

AD/M

ED x

100

)

Page 33: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

Micropipette method for soil texture

Page 34: Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

0 10 20 30 40 50 600

10

20

30

40

50

60

f(x) = 0.730612996212147 x + 0.816281062041538R² = 0.785993754083984

Clay analysis

% Clay, NAPT median

% C

lay,

mic

ropi

pett

e m

etho

d

1:1 line