Thanks to the people on this list I was able to fix my code for randomly
sampling. Thanks.
Now, I am moving on to the next step and I ran into another snag. I have a
large dataset but I am starting with a small made-up dataset until I figure
it out. I have two columns of data (age and length). I got R to read my
data called growth which is the age and length for 10 fish:
> growth
Age Length
1 2 200
2 5 450
3 6 600
4 7 702
5 8 798
6 5 453
7 4 399
8 1 120
9 2 202
Then I believe I converted my data to a three vectors by:
newgrowth<-c(growth)
Now I want to randomly select the values from this dataset to create a new
dataset. I want to do this many times, however, for now I am just trying to
get it to randomly select from the dataset only once. The trick is that I
need to keep the columns together. Each age corresponds to a length. For
example, the 200 length fish has an age of 2 years.
I tried to resample the data with this code:
sample(newgrowth)
However, I ended up getting the data listed as a row in the same order, not
randomly selected. I pasted the result below.
> sample(newgrowth)
$Age
[1] 2 5 6 7 8 5 4 1 2
$Length
[1] 200 450 600 702 798 453 399 120 202
Any advice on how I can randomly select from these 9 rows of data would be
greatly appreciated.
Mike
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