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Reference study data: Psychology

[Citation study data: Anthropology]


Actual Psychology references

Total References, N

1,214

References less than 51yrs old

1,201

modal age, t*

4

Umax = u(t*)

7.00%

mean age, µ

11.61

Skew

1.40

Kurtosis

378.79

lower quartile age

5

median age

8

upper quartile age

13

undated references

0.25%

Best line vs good curve

The line of best fit is R(t) =A + B.t where

The chosen Barnett curve is y(t) =a.(e^(-bt+d) - e^(-ct)) where

and therefore, for this mathematical model,

Psychology reference distributions, as a function of age

t

u(t)

y(t)

R(t)

  actual count

0

0.412%

0.395%

4.937%

5

1

3.130%

3.263%

4.817%

38

2

3.542%

4.984%

4.697%

43

3

4.366%

5.926%

4.577%

53

4

7.002%

6.343%

4.457%

85

5

6.178%

6.416%

4.338%

75

6

6.672%

6.267%

4.218%

81

7

6.343%

5.982%

4.098%

77

8

6.096%

5.619%

3.978%

74

9

5.684%

5.217%

3.858%

69

10

5.684%

4.804%

3.738%

69

11

4.448%

4.396%

3.618%

54

12

4.530%

4.003%

3.498%

55

13

3.460%

3.632%

3.378%

42

14

3.789%

3.286%

3.259%

46

15

3.130%

2.966%

3.139%

38

16

3.048%

2.673%

3.019%

37

17

2.142%

2.406%

2.899%

26

18

2.306%

2.163%

2.779%

28

19

1.236%

1.943%

2.659%

15

20

1.730%

1.744%

2.539%

21

21

1.483%

1.565%

2.419%

18

22

0.988%

1.404%

2.299%

12

23

1.895%

1.259%

2.180%

23

24

0.824%

1.128%

2.060%

10

25

1.400%

1.011%

1.940%

17

26

0.906%

0.906%

1.820%

11

27

0.906%

0.812%

1.700%

11

28

0.906%

0.727%

1.580%

11

29

0.412%

0.652%

1.460%

5

30

0.741%

0.584%

1.340%

9

31

0.494%

0.523%

1.220%

6

32

0.329%

0.468%

1.101%

4

33

0.247%

0.419%

0.981%

3

34

0.165%

0.376%

0.861%

2

35

0.412%

0.336%

0.741%

5

36

0.247%

0.301%

0.621%

3

37

0.247%

0.270%

0.501%

3

38

0.082%

0.242%

0.381%

1

39

0.165%

0.216%

0.261%

2

40

0.165%

0.194%

0.141%

2

41

0.082%

0.174%

0.022%

1

42

0.000%

0.155%

-0.098%

0

43

0.165%

0.139%

-0.218%

2

44

0.329%

0.125%

-0.338%

4

45

0.000%

0.112%

-0.458%

0

46

0.082%

0.100%

-0.578%

1

47

0.000%

0.090%

-0.698%

0

48

0.082%

0.080%

-0.818%

1

49

0.082%

0.072%

-0.938%

1

50

0.165%

0.064%

-1.057%

2

totals

0.98929

0.98929

0.98929

1201

Breakdown by format

  Conceptual format

  Physical format

a

19.11%

9

48.11%

b

1.07%

8

3.46%

c

7.25%

subtotal

51.57%

f

0.00%

7

17.79%

g

0.82%

6

0.49%

h

0.74%

subtotal

18.29%

i

0.00%

5

0.41%

subtotal

29.00%

4

1.98%

d

63.10%

3

1.07%

e

0.74%

2

9.31%

subtotal

63.84%

1

10.21%

j

0.00%

0

7.17%


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