[R] couple of how-to-do it in R questions regarding corelations and mean and SD of likert items

PIKAL Petr petr.pikal at precheza.cz
Tue Mar 6 14:10:10 CET 2018

```Hi

For first question, maybe I am completely wrong but

cor(swiss[,-1], swiss[,1])

should give you what you want in one step.

Second question

Without an example it is hard to say but maybe aggregate is the way forward.

> aggregate(iris[,1:4], list(iris\$Species), function (x) c(mean=mean(x), sd=sd(x)))
Group.1 Sepal.Length.mean Sepal.Length.sd Sepal.Width.mean Sepal.Width.sd
1     setosa         5.0060000       0.3524897        3.4280000      0.3790644
2 versicolor         5.9360000       0.5161711        2.7700000      0.3137983
3  virginica         6.5880000       0.6358796        2.9740000      0.3224966

Cheers
Petr

> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of faiz rasool
> Sent: Tuesday, March 6, 2018 1:04 PM
> To: r-help at r-project.org
> Subject: [R] couple of how-to-do it in R questions regarding corelations and
> mean and SD of likert items
>
> Dear list, I have the following how-to-do it in R, questions.
>
> Suppose I have ten independent variables, and one dependent variable.
> I want to find the Pearson correlation of all the IVs with the DV, but not the
> correlation between the IVs.
>
> What I know so far, about R, that I have to type the cor () function ten times,
> each time requesting for a correlation between one IV and the DV.
>
> I was wondering that is there a way that I can accomplish what I want with a
> single function or a fewer line of codes.
>
> My final goal is to create a table in Microsoft word comprising of ten rows,
> each row for each independent variable and its correlation with the DV.
>
> Based on what I know, I’ll be typing cor (IV,,DV), ten times, and then typing the
> values in the table in MS  Word.
>
>
> Secondly, I  would like to create a table that provides the details of means and
> standard deviations, of multiple variables.
>
> The variables are  ratings scores of  likert  type items. What I’d like to do is to
> construct a table, where each row has the question, its mean and standard
> deviation. I know that using the psych package, I can have the mean of each
> item in the scale, but, how to develop a table that has the item, mean, and SD
> on a same row? I do not know.
>
> Thank you for reading my questions.
>
> Regards,
> Faiz.
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> and provide commented, minimal, self-contained, reproducible code.

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