[R] Request for aid in first R script

[Thierry Onkelinx]

Dear Kepler,

Yes, R can do this all. But this is is to help you when you get stuck, not
to do all the work for you... You are asking basic stuff, so any
introduction book on R should contain sufficient information to get you
going. So please do read on of those first.

Best regards,

ir. Thierry Onkelinx
Statisticus / Statistician

Vlaamse Overheid / Government of Flanders
INSTITUUT VOOR NATUUR- EN BOSONDERZOEK / RESEARCH INSTITUTE FOR NATURE AND
FOREST
Team Biometrie & Kwaliteitszorg / Team Biometrics & Quality Assurance
thierry.onkelinx using inbo.be
Havenlaan 88 bus 73, 1000 Brussel
www.inbo.be

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To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to say
what the experiment died of. ~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data. ~ Roger Brinner
The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey
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<https://www.inbo.be>


Op ma 19 nov. 2018 om 11:39 schreef Rui Fernandes <rui.kepler using gmail.com>:

> Good morning
>
> My compliments to all.
>
> Since I'm a newbie on R, I was wondering if you could help me to achieve a
> small project that I think it's possible with this project (I cant seem to
> find a similar tool)
>
> I have a data file with about 2000 value lines, organized like this:
>
> x;y;z;j;
> ...
>
> I want to find diferent correlations (linear regression with
> Levenberg–Marquardt or least squares) between the x values and a y or z
> pair. For instance, between x and y.
>
> So, what I'm trying to do is:
>
> 1) Load the file (is there a limit on the load size? If yes, can I load it
> in sequence by parts?)
> 2) Define 100 sets of 20 values each (also sequence, from x1 to xn: first
> from x1 to x20, next from x21 to x41, etc.) or process one set at the time
> in case of file limits in 1)
> 3) Define a fitting function
> 4) Use the same function model to find the best fit for each set
> 5) Save in a file, the coefficients of those fits.
>
> Can this be done accurately with R?
>
> It would save me a lot of programming. The files will soon have about 1
> million lines, which is a lot to process.
>
> I would apreciate very much if someone could help me.
>
> Kind regards
>
> Kepler
>
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>
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