Sorry for not being clear.
In the dataset there are around 100 or so days of data (in the case also rows
of data)
I need to make sure that the person meets that c1 is at least 100 AND c2 is at
least 8 for 5 of 7 continuous days.
I will play with what I have and see if I can find out how to do this.
Thanks for the help!
Michael
>>> Stephan Kolassa 07/17/10 4:50 PM >>>
Mike,
I am slightly unclear on what you want to do. Do you want to check rows
1 and 7 or 1 *to* 7? Should c1 be at least 100 for *any one* or *all*
rows you are looking at, and same for c2?
You can sort your data like this:
data <- data[order(data$ds),]
Type ?order for help. But also do this for added enlightenment...:
library(fortunes)
fortune("dog")
Next, your analysis on the sorted data frame. As I said, I am not
entirely clear on what you are looking at, but the following may solve
your problem with choices "1 to 7" and "any one" above.
foo <- 0
for ( ii in 1:(nrow(data)-8) ) {
if (any(data$c1[ii+seq(0,6)]>=100) & any(data$c2[ii+seq(0,6)]>=8)) {
foo <- 1
break
}
}
The variable "foo" should contain what you want it to. Look at ?any
(and, if this does not do what you want it to, at ?all) for further info.
No doubt this could be vectorized, but I think the loop is clear enough.
Good luck!
Stephan
Michael Hess schrieb:
> Hello R users,
>
> I am a researcher at the University of Michigan looking for a solution to an
> R problem. I have loaded my data in from a mysql database and it looks like
> this
>
>> data
> ds c1 c2
> 1 2010-04-03 100 0
> 2 2010-04-30 11141 15
> 3 2010-05-01 3 16
> 4 2010-05-02 7615 14
> 5 2010-05-03 6910 17
> 6 2010-05-04 5035 3
> 7 2010-05-05 3007 15
> 8 2010-05-06 4 14
> 9 2010-05-07 8335 17
> 10 2010-05-08 2897 13
> 11 2010-05-09 6377 17
> 12 2010-05-10 3177 17
> 13 2010-05-11 7946 15
> 14 2010-05-12 8705 0
> 15 2010-05-13 9030 16
> 16 2010-05-14 8682 16
> 17 2010-05-15 8440 15
>
>
> What I am trying to do is sort by ds, and take rows 1,7, see if c1 is at
> least 100 AND c2 is at least 8. If it is not, start with check rows 2,8 and
> if not there 3,9....until it loops over the entire file. If it finds a set
> that matches, set a new variable equal to 1, if never finds a match, set it
> equal to 0.
>
> I have done this in stata but on this project we are trying to use R. Is
> this something that can be done in R, if so, could someone point me in the
> correct direction.
>
> Thanks,
>
> Michael Hess
> University of Michigan
> Health System
>
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