> r_power
       r trtdf errdf   f_0.05     power
 [1,]  2     4     5 5.192168 0.3164266
 [2,]  3     4    10 3.478050 0.5680743
 [3,]  4     4    15 3.055568 0.7102072
 [4,]  5     4    20 2.866081 0.7934287
 [5,]  6     4    25 2.758710 0.8456557
 [6,]  7     4    30 2.689628 0.8804210
 [7,]  8     4    35 2.641465 0.9046794
 [8,]  9     4    40 2.605975 0.9222593
 [9,] 10     4    45 2.578739 0.9353983
[10,] 11     4    50 2.557179 0.9454726
[11,] 12     4    55 2.539689 0.9533645
[12,] 13     4    60 2.525215 0.9596611
[13,] 14     4    65 2.513040 0.9647645
[14,] 15     4    70 2.502656 0.9689581
[15,] 16     4    75 2.493696 0.9724457
[16,] 17     4    80 2.485885 0.9753773
[17,] 18     4    85 2.479015 0.9778649
[18,] 19     4    90 2.472927 0.9799939
[19,] 20     4    95 2.467494 0.9818301
[20,] 21     4   100 2.462615 0.9834246
[21,] 22     4   105 2.458210 0.9848182
[22,] 23     4   110 2.454213 0.9860432
[23,] 24     4   115 2.450571 0.9871257
[24,] 25     4   120 2.447237 0.9880870
[25,] 26     4   125 2.444174 0.9889446
[26,] 27     4   130 2.441350 0.9897128
[27,] 28     4   135 2.438739 0.9904037
[28,] 29     4   140 2.436317 0.9910272
[29,] 30     4   145 2.434065 0.9915919