Hi Ion:
Here's something that might work for you
> flight.df <- read.table(file="clipboard",header=TRUE)
> by(flight.df$NoFlights,flight.df$Week,summary)
flight.df$Week: week1
Min. 1st Qu. Median Mean 3rd Qu. Max.
30.00 30.75 32.00 31.75 32.25 36.00
------------------------------------------------------------
flight.df$Week: week2
Min. 1st Qu. Median Mean 3rd Qu. Max.
30.00 30.75 31.50 31.50 32.25 33.00
------------------------------------------------------------
flight.df$Week: week23
Min. 1st Qu. Median Mean 3rd Qu. Max.
28.0 29.0 30.0 31.0 32.5 35.0
------------------------------------------------------------
flight.df$Week: week57
Min. 1st Qu. Median Mean 3rd Qu. Max.
30 30 30 30 30 30
>
Hope this helps!
Sincerely,
Erin
On Mon, Jun 24, 2013 at 6:53 PM, Ion Mateescu <ion.mat...@gmail.com> wrote:
> This may be a simple problem but I spent most of my day today trying to
> figure it out, as I am not a programmer. I have a dataframe with
> observations from different weeks of the year, numbered. My variable
> "week" has values week1, week4, week9, etc. Not all weeks are represented.
> I need to calculate statistics and compare means for a measured variable
> (no_of_flights) :
>
> Week NoFlights
> week1 31.00
> week1 31.00
> week1 36.00
> week1 32.00
> week1 30.00
> week1 30.00
> week1 30.00
> week2 31.00
> week2 32.00
> week1 30.00
> week1 31.00
> week1 32.00
> week23 30.00
> week23 35.00
> week57 30.00
> week1 32.00
> week1 33.00
> week1 33.00
> week2 30.00
> week2 33.00
> week1 32.00
> week1 32.00
> week1 33.00
> week23 28.00
>
> Any help is appreciated.
>
> River
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodg...@gmail.com
[[alternative HTML version deleted]]
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and provide commented, minimal, self-contained, reproducible code.
