I spent the whole afternoon on it, but there is still no progress. I wish I
could take some courses... :(
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Hi, Mike,
thank you very much!!:)
the following two functions are really helpful, which I didn't even know.
Actually, I searched the forum for something like this, but failed. Now I am
still trying to make up my own functions. :)
sample(a[,2],2) #randomly draw two numbers from a column
sample(
You could try writing a loop
a<-data.frame(c(1:10),c(21:30))
M<-10 #number of iterations- scale up to 1000 once you get your sampling
function working
res<-NULL #place to store your results
for i in (1:M)
{
ares<-sample(a[,2],1)
res<-c(res, ares)
}
res
It's up to you how to
Also, I need some function at the end which would enable me to draw 1000 such
random samples. thanks! :)
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Hi Wallace,
Have you tried playing with sample()? Note that you can apply this function
both to whole dataframes, as well as specific items within a vector. If you
play with applying the function to different ways of indexing your sample
data, you will likely arrive at your solution.
for example:
Dear Ista Zahn-2,
If you can give me some advice, I really appreciate it. I have been working
on it for days. it seems hard for some novice of R like me to write flexible
functions myself.
This is for my dissertation. CSE and WSE are two scales of the same
construct. The sampling strategy I wan
This can of course be done, but before I make any attempt to do it I
have to ask: why do you want this?
On Wed, Nov 17, 2010 at 7:08 PM, wangwallace wrote:
>
> I have another question about drawing samples from a data frame. This might
> sound really tricky. Let me use a data frame I have posted
I have another question about drawing samples from a data frame. This might
sound really tricky. Let me use a data frame I have posted earlier as an
example:
SubIDCSE1 CSE2 CSE3 CSE4 WSE1 WSE2 WSE3 WSE4
1 6 5 6 2 6 22 4
2
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