A solução é simples, basta ver o formato das datas. A modificação abaixo deve ser suficiente se o resta dos seus dados seguirem o mesmo padrão. z <- read.zoo("dados.csv", header = TRUE, sep = ",", format = "%m/%d/%y")

z CDI Ibovespa ALFA.DINAMICO.FIA ALFA.FIA 1997-01-02 100.2442 6956 77.56310 0.33373 1997-01-03 100.3214 6998 78.05032 0.34725 1997-01-06 100.3986 7160 79.31970 0.34982 1997-01-07 100.4759 7297 82.01036 0.34084 1997-01-08 100.5533 7427 82.28164 0.34426 1997-01-09 100.6307 7454 82.79493 0.34285 1997-01-10 100.7089 7478 82.04698 0.34263 1997-01-13 100.7871 7412 82.32868 0.34275 1997-01-14 100.8654 7621 84.52306 0.34776 1997-01-15 100.9437 7668 86.36466 0.34922 1997-01-16 101.0221 7656 86.74005 0.35130 1997-01-17 101.1009 7816 86.74305 0.35152 1997-01-20 101.1798 7835 86.84854 0.35297 1997-01-21 101.2584 7905 87.77227 0.35453 1997-01-22 101.3370 7818 87.63108 0.35711 1997-01-23 101.4161 7891 87.96762 0.35650 1997-01-24 101.4955 7760 87.75150 0.35470 1997-01-27 101.5747 7759 87.71396 0.35453 1997-01-28 101.6552 7850 87.64120 0.35487 1997-01-29 101.7345 7737 86.20481 0.35258 1997-01-30 101.8169 7789 86.37315 0.35225 1997-01-31 101.9103 7965 88.24893 0.35641 1997-02-03 102.0037 8096 89.45418 0.35969 1997-02-04 102.0979 8102 89.39141 0.35950 1997-02-05 102.1918 8171 90.26877 0.36263 1997-02-06 102.2862 8148 90.26682 0.36110 1997-02-07 102.3806 8317 92.41892 0.36529 1997-02-12 102.4751 8671 96.43418 0.37360

2013/4/29 Marcos Vagner Macedo <marcosvmacedo@gmail.com>

Daniel,

Segue um exemplo dos dados para tornar o problema reproduzível.

Data CDI Ibovespa ALFA DINAMICO FIA ALFA FIA 01/02/97 100.244198 6956 77.5631 0.33373 01/03/97 100.32139 6998 78.05032 0.34725 01/06/97 100.398636 7160 79.3197 0.34982 01/07/97 100.475946 7297 82.01036 0.34084 01/08/97 100.553312 7427 82.28164 0.34426 01/09/97 100.630733 7454 82.79493 0.34285 01/10/97 100.70889 7478 82.04698 0.34263 01/13/97 100.78711 7412 82.32868 0.34275 01/14/97 100.865386 7621 84.52306 0.34776 01/15/97 100.943725 7668 86.36466 0.34922 01/16/97 101.022127 7656 86.74005 0.3513 01/17/97 101.100925 7816 86.74305 0.35152 01/20/97 101.179779 7835 86.84854 0.35297 01/21/97 101.258363 7905 87.77227 0.35453 01/22/97 101.337011 7818 87.63108 0.35711 01/23/97 101.416054 7891 87.96762 0.3565 01/24/97 101.495494 7760 87.7515 0.3547 01/27/97 101.574664 7759 87.71396 0.35453 01/28/97 101.655242 7850 87.6412 0.35487 01/29/97 101.734531 7737 86.20481 0.35258 01/30/97 101.816938 7789 86.37315 0.35225 01/31/97 101.910268 7965 88.24893 0.35641 02/03/97 102.003692 8096 89.45418 0.35969 02/04/97 102.097876 8102 89.39141 0.3595 02/05/97 102.191799 8171 90.26877 0.36263 02/06/97 102.286157 8148 90.26682 0.3611 02/07/97 102.380603 8317 92.41892 0.36529 02/12/97 102.475135 8671 96.43418 0.3736

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