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194

DATA SETS

Acres

Yields

Year

Corn

Wheat

Corn

Wheat

1930

103,915

3,072

67,559

20.5

13.0

14.2

1931

109,364

3,835

66,463

24.5

15.1

16.3

1932

113,024

3,704

66,281

26.5

15.1

13.1

1933

109,830

3,537

69,009

22.8

12.9

11.2

1934

100,563

5,769

64,064

18.7

14.9

12.1

1935

99,974

6,966

69,611

24.2

16.8

12.2

1936

101,959

6,127

73,970

18.6

14.3

12.8

1937

97,174

6,332

80,814

28.9

17.9

13.6

1938

94,473

7,318

78,981

27.8

20.4

13.3

1939

91,639

9,565

62,802

29.9

20.9

14.1

1940

88,692

10,487

61,820

28.9

16.2

15.3

1941

86,837

10,068

62,707

31.2

18.2

16.8

1942

88,818

13,696

53,000

35.4

19.0

19.5

1943

94,341

14,191

55,984

32.6

18.3

16.4

1944

95,475

13,118

66,190

33.0

18.8

17.7

1945

89,261

13,056

69,192

33.1

18.0

17.0

1946

88,898

11,706

71,578

37.2

20.5

17.2

1947

85,032

13,052

78,314

28.6

16.3

18.2

1968

85,522

11,987

78,345

43.0

21.3

17.9

1949

86,738

11,872

83,905

38.2

22.3

14.5

1950

82,859

15,048

71,287

38.2

21.7

16.5

1951

83,275

15,176

78,524

36.9

20.8

16.0

1952

82,230

15,958

78,645

41.8

20.7

18.4

1953

81,574

16,394

78,931

40.7

18.2

17.3

1954

82,185

18,541

62,539

39.4

20.0

18.1

1955

80,932

19,674

58,246

42.0

20.1

19.8

1956

77,828

21,700

60,655

47.4

21.8

20.2

1957

73,180

21,038

49,834

48.3

23.2

21.8

1958

73,351

25,108

56,017

52.8

24.2

27.5

1959

82,742

23,349

56,706

53.1

23.5

21.6

1960

81,425

24,440

54,906

54.7

23.5

26.1

1961

65,919

27,787

55,707

62.4

25.1

23.9

1962

65,017

28,418

49,274

64.7

24.2

25.0

1963

68,771

29,462

53,364

67.9

24.4

25.2

1964

65,823

31,605

55,672

62.9

22.8

25.8

1965

65,171

35,277

57,361

74.1

24.5

26.5

1966

66,347

37,294

54,105

73.1

25.4

26.3

1967

71,156

40,819

67,264

80.1

24.5

25.8

1968

65,126

42,265

61,860

79.5

26.7

28.4

1969

64,264

42,534

53,450

85.9

27.4

30.6

1970

66,836

43,082

48,739

72.4

26.7

31.0

(contd)



Year

Acres

Yields

Corn

Wheat

Corn

Wheat

1971

74,179

43,476

53,822

88.1

27.5

33.9

1972

67,126

46,866

54,913

97.0

27.8

32.7

1973

72,253

56,549

59,254

91.3

27.8

31.6

1974

77,935

52,479

71,044

71.9

23.7

27.3

1975

78,719

54,590

74,900

86.4

28.9

30.6

1976

84,588

50,269

80,395

88.0

26.1

30.3

1977

84,328

58,978

75,410

90.8

30.6

30.7

1978

81,675

64,708

65,989

101.0

29.4

31.4

1979

81,394

71,411

71,424

109.5

32.1

34.2

1980

84,043

69,930

80,788

91.0

26.5

33.5

1981

84,097

67,543

88,251

108.9

30.1

34.5

1982

81,857

70,884

86,232

113.2

31.5

35.5

1983

60,217

63.779

76,419

81.1

26.2

39.4

1984

80,543

67,755

79,213

106.7

28.1

38.8

1985

83,348

63,130

75,575

118.0

34.1

37.5

1986

76,646

61,835

72,007

119.3

33.1

34.8



Vector Autoregressions, Unit Roots, and Cointegration

14.1 Introduction

14.2 Vector Autoregressions

14.3 Problems with VAR Models in Practice

14.4 Unit Roots

14.5 Unit Root Tests

14.6 Cointegration

14.7 The Cointegrating Regression

14.8 Vector Autoregressions and Cointegration

14.9 Cointegration and Error Correction Models

14.10 Tests for Cointegration

14.11 Cointegration and Testing of the REH and MEH

14.12 A Summary Assessment of Cointegration Summary

Exercises



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