[R] data analysis. R

Gabor Grothendieck ggrothendieck at gmail.com
Sun Mar 22 04:56:58 CET 2009

```This works with the example.  If the real data is different it may not
work.  To run the example below just copy and paste it into R.
To run with the real data replace textConnection(Lines) with
"insulation.txt" everywhere.

Lines <- "Before insul    After insul.
temp    gas     temp    gas
-0.8    7.2    -0.7    4.8
-0.7    6.9    0.8    4.6
0.4    6.4    1.0    4.7
2.5    6.0    1.4    4.0
2.9    5.8    1.5    4.2
3.2    5.8    1.6    4.2
3.6    5.6    2.3    4.1
3.9    4.7    2.5    4.0
4.2    5.8    2.5    3.5
4.3    5.2    3.1    3.2
5.4    4.9    3.9    3.9
6.0    4.9    4.0    3.5
6.0    4.3    4.0    3.7
6.0    4.4    4.2    3.5
6.2    4.5    4.3    3.5
6.3    4.6    4.6    3.7
6.9    3.7    4.7    3.5
7.0    3.9    4.9    3.4
7.4    4.2    4.9    3.7
7.5    4.0    4.9    4.0
7.5    3.9    5.0    3.6
7.6    3.5    5.3    3.7
8.0    4.0    6.2    2.8
8.5    3.6    7.1    3.0
9.1    3.1    7.2    2.8
10.2  2.6    7.5    2.6
8.0    2.7
8.7    2.8
8.8    1.3
9.7    1.5"

nfld <- count.fields(textConnection(Lines))
data.lines <- ifelse(nfld == 2, paste("NA NA", data.lines), data.lines)

On Sat, Mar 21, 2009 at 8:13 PM, UBC <cheong0618 at hotmail.com> wrote:
>
> so i am having this question
> what should i do if the give data file (.txt) has 4 columns, but different
> lengths?
> how can i read them in R?
> any idea for the following problem?
>
>
> Gas consumption (1000 cubic feet) was measured before and after insulation
> was put into
> a house. We are interested in looking at the effect of insulation on gas
> consumption. The
> average outside temperature (degrees celcius) was also measured. The data
> are included in
> the file "insulation.txt".
>
> (a) Determine if insulation in the house effects the average gas
> consumption.
> (b) How much extra gas is used when there is no insulation? Provide an
> interval estimate
> as well as a point estimate.
>
> heres the content in "insulation.txt"  (u can just copy and paste it to the
>
> Before insul    After insul.
> temp    gas     temp    gas
> -0.8    7.2    -0.7    4.8
> -0.7    6.9    0.8    4.6
> 0.4    6.4    1.0    4.7
> 2.5    6.0    1.4    4.0
> 2.9    5.8    1.5    4.2
> 3.2    5.8    1.6    4.2
> 3.6    5.6    2.3    4.1
> 3.9    4.7    2.5    4.0
> 4.2    5.8    2.5    3.5
> 4.3    5.2    3.1    3.2
> 5.4    4.9    3.9    3.9
> 6.0    4.9    4.0    3.5
> 6.0    4.3    4.0    3.7
> 6.0    4.4    4.2    3.5
> 6.2    4.5    4.3    3.5
> 6.3    4.6    4.6    3.7
> 6.9    3.7    4.7    3.5
> 7.0    3.9    4.9    3.4
> 7.4    4.2    4.9    3.7
> 7.5    4.0    4.9    4.0
> 7.5    3.9    5.0    3.6
> 7.6    3.5    5.3    3.7
> 8.0    4.0    6.2    2.8
> 8.5    3.6    7.1    3.0
> 9.1    3.1    7.2    2.8
> 10.2  2.6    7.5    2.6
>                8.0    2.7
>                8.7    2.8
>                8.8    1.3
>                9.7    1.5
>
>
>
> thx and any ideas would help.
> --
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>
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