Hi
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Ludovico
> Piccolo
> Sent: Sunday, October 8, 2017 4:40 PM
> To: r-help at r-project.org
> Subject: [R] Manipulations with CO2 dataset on R
>
> Hi,
> I just started a new course this semester on R, I never used it in my life
and i'm
> stuck on these questions from 3 days, it would be really nice if someone
could
> explain me the answers with the relative commands.
>
> thanks a lot in advance
>
> The following 7 questions are based on the CO2 dataset of R.
>
> 1) How many of the plants in CO2 are Mc2 for Plant?
?table
>
> 2) How many are either Mc2 or Mn2?
?table or ?aggregate
>
> 3) How many are Quebec for Type and nonchilled for Treatment?
?aggregate
>
> 4) How many have a concentration (conc) of 350 or bigger?
?table and ?">"
>
> 5) How many have a concentration between 350 and 435 (inclusive)?
?table and ?">"
>
> 6) How many have a concentration between 300 and 450 (inclusive) and are
> nonchilled?
?table or ?aggregate and ?">"
>
> 7)How many have an uptake that is less than 1/10 of the concentration (in
the
> units reported)?
>
?table or ?aggregate and ?">"
R comes with quite extensive help pages and with R-intro which you should
consult first.
Cheers
Petr
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