[R] problem with lm and predict - no predictions made

From: Keld Jørn Simonsen <keld_at_dkuug.dk>
Date: Thu, 03 Jul 2008 03:40:49 +0200


Hi

I have a problem with lm and predict

I have

us

 [1]  2789.53  3128.43  3255.03  3536.68  3933.18  4220.25  4462.83 4739.48
 [9]  5103.75  5484.35  5803.08  5995.93  6337.75  6657.40  7072.23 7397.65
[17]  7816.83  8304.33  8746.98  9268.43  9816.98 10127.95 10469.60 10960.75
[25] 11685.93 12433.93 13194.70 13843.83


 us.p

 [1] 227.62 229.92 232.13 234.25 236.31 238.42 240.59 242.75 244.97 247.29
[11] 250.05 253.39 256.78 260.15 263.33 266.46 269.58 272.82 276.02 279.20
[21] 282.31 285.25 288.10 290.85 293.53 296.26 299.08 301.97

 us.l = lm(log(us) ~ log(us.p))
> predict(us.l,n.ahead=5)

       1 2 3 4 5 6 7 8 8.079754 8.131908 8.181531 8.228692 8.274111 8.320224 8.367224 8.413588

       9 10 11 12 13 14 15 16 8.460813 8.509709 8.567285 8.636117 8.705057 8.772694 8.835719 8.897015

      17 18 19 20 21 22 23 24 8.957402 9.019376 9.079867 9.139289 9.196752 9.250495 9.302067 9.351347

      25 26 27 28
9.398927 9.446950 9.496094 9.545979

Why does predict not give me any predictions? The result of predict() is same lenght (28) as the us and us.p variables.

best regards
keld



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