Prime-time ratings as compiled by the A.C. Nielsen Co. for Jan. 2-8. Top 20 listings include rating for week, season-to-date rankings in parentheses and total homes.

An ``X'' in parentheses denotes one-time-only presentation. A rating measures the percentage of the nation's 95.4 million TV homes. Each ratings point represents 954,000 households.

1. (2) ``Seinfeld,'' NBC, 23.2, 22.1 million homes

2. (4) ``E.R.,'' NBC, 21.2, 20.2 million homes

3. (2) ``Grace Under Fire,'' ABC, 20.0, 19.0 million homes

4. (1) ``Home Improvement,'' ABC, 19.6, 18.7 million homes

5. (17) ``Friends,'' NBC, 17.6, 16.8 million homes

5. (13) ``Madman of the People,'' NBC, 17.6, 16.8 million homes

7. (13) ``Mad About You,'' NBC, 17.2, 16.4 million homes

7. (7) ``Roseanne,'' ABC, 17.2, 16.4 million homes

7. (6) ``60 Minutes,'' CBS, 17.2, 16.4 million homes

10. (9) ``Murder, She Wrote,'' CBS, 16.9, 16.1 million homes

11. ``See Jane Run _ ABC Sunday Movie,'' 16.6, 15.8 million homes

12. (7) ``NYPD Blue,'' ABC, 16.5, 15.7 million homes

13. (12) ``Frasier,'' NBC, 16.3, 15.6 million homes

14. ``Nanny,'' CBS, 15.9, 15.2 million homes

15. (19) ``Dave's World,'' CBS, 15.8, 15.0 million homes

16. (20) ``20-20,'' ABC, 15.7, 15.0 million homes

17. (10) ``Ellen,'' ABC, 15.6, 14.9 million homes

18. (15) ``Murphy Brown,'' CBS, 15.3, 14.6 million homes

19. (10) ``Cybill,'' CBS, 15.2, 14.5 million homes

20. ``PrimeTime Live,'' ABC, 14.9, 14.2 million homes

20. (X) ``Sugar Bowl,'' ABC, 14.9, 14.2 million homes

___

22. (17) ``E.R. _ NBC Monday Movie,'' 14.7

23. ``Wings,'' NBC, 14.4

24. ``Family Matters,'' ABC, 13.6

25. (X) ``America's Funniest Videos,'' ABC, 13.5

25. ``Chicago Hope,'' CBS, 13.5

27. ``Boy Meets World,'' ABC, 13.2

28. ``Full House,'' ABC, 13.0

28. ``Something Wilder,'' NBC, 13.0

28. ``Step By Step,'' ABC, 13.0

31. ``Dateline NBC-Wed.,'' NBC, 12.9

31. ``Me and the Boys,'' ABC, 12.9

33. ``Ricochet _ NBC Sunday Movie,'' 12.4

34. (X) ``Grace Under Fire,'' ABC, 12.2

34. ``SeaQuest DSV,'' NBC, 12.2

36. ``Hangin' With Mr. Cooper,'' ABC, 12.1

36. ``Law and Order,'' NBC, 12.1

38. ``Simpsons,'' Fox, 12.0

39. ``Dangerous Intentions _ CBS Tuesday Movie,'' CBS, 11.9

39. ``Rescue: 911,'' CBS, 11.9

41. ``Women of the House,'' CBS, 11.8

42. ``Beverly Hills, 90210,'' Fox, 11.5

42. ``Dateline NBC-Fri.,'' NBC, 11.5

42. ``Earth 2,'' NBC, 11.5

42. ``Married...With Children,'' Fox, 11.5

46. ``Due South,'' CBS, 11.3

46. (X) ``Friends,'' NBC, 11.3

48. ``Diagnosis Murder,'' CBS, 11.2

48. ``Lois & Clark,'' ABC, 11.2

50. (X) ``Roseanne,'' ABC, 11.1

51. (16) ``Season of Hope _ CBS Sunday Movie,'' CBS, 11.0

52. ``Eye to Eye with Connie Chung,'' CBS, 10.9

52. ``Walker, Texas Ranger,'' CBS, 10.9

54. ``Matlock,'' ABC, 10.8

55. ``Picket Fences,'' CBS, 10.6

56. ``Dateline NBC-Tue.,'' NBC, 10.4

56. ``Day One,'' ABC, 10.4

58. ``House of Buggin','' Fox, 10.3

58. ``Unsolved Mysteries,'' NBC, 10.3

60. ``Dr. Quinn Medicine Woman,'' CBS, 10.2

60. ``X-Files,'' Fox, 10.2

62. ``Melrose Place,'' Fox, 9.9

63. ``Cosby Mysteries,'' NBC, 9.8

64. ``Northern Exposure,'' CBS, 9.7

65. ``Sisters,'' NBC, 9.6

66. ``Commish,'' ABC, 9.5

67. ``Homicide: Life on the Street,'' NBC, 9.1

68. ``America's Funniest Home Videos,'' ABC, 8.9

68. ``48 Hours,'' CBS, 8.9

70. ``Boys Are Back,'' CBS, 8.7

71. ``Cops 2,'' Fox, 8.6

71. ``Double Rush,'' CBS, 8.6

71. ``Under Suspicion,'' CBS, 8.6

74. ``Five Mrs. Buchanans,'' CBS, 8.5

74. ``Living Single,'' Fox, 8.5

76. ``America's Most Wanted,'' Fox, 8.2

76. ``Cops,'' Fox, 8.2

78. ``Dream On,'' Fox, 8.0

79. ``Martin,'' Fox, 7.9

79. ``Mommies,'' NBC, 7.9

81. ``Sweet Justice,'' NBC, 7.6

82. ``Empty Nest,'' NBC, 7.5

82. ``New York Undercover,'' Fox, 7.5

84. ``Fudge-A-Mania _ ABC Saturday Family Movie,'' 7.4

85. ``Love & War,'' CBS, 7.3

86. (X) ``Mommies Preview,'' NBC, 7.2

87. ``My So-Called Life,'' ABC, 7.1

87. ``Party of Five,'' Fox, 7.1

89. ``Get Smart,'' Fox, 6.9

90. ``Models Inc.,'' Fox, 6.4

91. ``Fresh Prince of Bel Air,'' NBC, 6.3

92. ``Fast Times at Ridgemont High _ Fox Tuesday Movie,'' 5.4

93. ``M.A.N.T.I.S.,'' Fox, 5.2

94. ``Simpsons Two,'' Fox, 5.1