Hi Felipe,
Daniel mentions imputation is a disputed practice. There are
recommendations and rules of thumb for its use. I am not sure that
imputation is disputed. I would be interested to see some links to articles
recommending against its use.
Paul
----- Original Message -----
From: "Felipe Carrillo" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, July 13, 2008 5:46 AM
Subject: [R] Excel Trend Function
Hi:
I have a dataset and need to interpolate for missing days. In Excel I
either average from sampled days from above and below the missing days or
use the TREND function to make up for the missing values. I have been
reading about na.approx, is this function similar to the TREND function?
Which is the best recommendable way to make up for missing data?
Here's my dataset: weeks 17,18,26 and 46 have 0 daysSamp.
Year Week daysSamp Lower TotalPD Upper varTotalPD
2006 47 6 126988 188259 249530 1045878675
2006 48 7 189155 253350 317545 1148102355
2006 49 7 103300 132741 162182 241480186
2006 50 6 11801 252576 493352 16151006813
2006 51 7 2348 3671 4994 487926
2006 52 5 2606 29901 57196 215454181
2006 2 7 2968 4513 6058 664723
2006 3 7 1128 1889 2650 161231
2006 4 7 479 963 1447 65196
2006 5 7 2819 4413 6007 708094
2006 6 6 -1009 3128 7264 4766743
2006 7 7 -5239 10769 26777 71387835
2006 8 7 150 503 856 34685
2006 9 7 1858 2989 4120 356562
2006 10 7 193 494 795 25281
2006 11 7 125 346 567 13627
2006 12 7 432 767 1102 31189
2006 13 7 1229 1867 2505 113569
2006 14 7 813 1339 1865 77140
2006 15 4 -66 124 315 10105
2006 16 7 152 903 1654 157242
2006 17 0
2006 18 0
2006 19 5 0 0 0 0
2006 20 4 0 0 0 0
2006 21 5 0 0 0 0
2006 22 6 0 0 0 0
2006 23 7 -65 285 635 34112
2006 24 6 0 0 0 0
2006 25 7 0 0 0 0
2006 26 0
2006 27 4 228 931 1634 137726
2006 28 4 801 2231 3662 569977
2006 29 4 4544 9242 13939 6147522
2006 30 5 15798 28465 41131 44697915
2006 31 5 25398 41049 56701 68245523
2006 32 5 48197 82216 116235 322416917
2006 33 5 142980 230411 317841 2129630128
2006 34 5 227141 360468 493794 4952314336
2006 35 5 467244 756325 1045405 23281569629
2006 36 5 281049 463331 645614 9256900449
2006 37 2 227636 620330 1013023 42961663047
2006 38 3 478990 983472 1487954 70903343603
2006 39 7 539690 846522 1153354 26228718974
2006 40 7 320959 457866 594773 5221891252
2006 41 7 427561 582452 737343 6683813344
2006 42 7 271788 351103 430418 1752614293
2006 43 7 165019 208853 252687 535301133
2006 44 7 91514 117390 143266 186537178
2006 45 7 59061 79187 99313 112842787
2006 46 0
Felipe D. Carrillo
Supervisory Fishery Biologist
Department of the Interior
US Fish & Wildlife Service
California, USA
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
