R help - Mar 2007 - altering prefix to multiple variables in different locations within a command file

Hello,

I am seeking advice regarding how I might add the prefix " kc$ " to 
variables in  a series of commands. The complication is that there is 
a large number of variables with different commands. Examples of the 
variables in typical commands follow.

It is simple to use search & replace for common variables such as 
"group" but I would appreciate advice about whether there is a  way 
to readily alter the remaining variables.

Bob Green


CrossTable(group,TOC2,chisq=TRUE,resid=TRUE, missing.include=FALSE)
fisher.test(group,TOC2)

tapply(TOC2,  group,  mean)
tapply( TOC2,  group, sd)

oneway.test ( TOC2 ~  group, var.equal=FALSE)
kruskal.test ( TOC2 ~  group)


broadcast  ==""
broadcast   [broadcast  ==""] <- "n"
CrossTable( group,broadcast   ,chisq=TRUE,resid=TRUE, missing.include=FALSE)
fisher.test(group,broadcast)

jealous [jealous=="y (not victim)"] = "n"
jealous==""
jealous [jealous==""] <- "n"
jealous==""
CrossTable(group,jealous ,chisq=TRUE,resid=TRUE, missing.include=FALSE)
fisher.test(group,jealous)

On Mar 12, 2007, at 4:54 PM, Bob Green wrote:
> Hello,
>
> I am seeking advice regarding how I might add the prefix " kc$ "
to
> variables in  a series of commands. The complication is that there is
> a large number of variables with different commands. Examples of the
> variables in typical commands follow.
Maybe I've misunderstood what you want to do, but would "with"
meet
the case?

 > a
Error: object "a" not found
 > x<-list(a=5)
 > with(x,a)
[1] 5
 > x$a
[1] 5
 >

See ?with

> It is simple to use search & replace for common variables such as
> "group" but I would appreciate advice about whether there is a 
way
> to readily alter the remaining variables.
>
> Bob Green
Haris Skiadas
Department of Mathematics and Computer Science
Hanover College

I think what you are looking for is attach()?

attach(kc)
# commands (don't need to prefix variables with "kc$")
detach(kc)

In this way an environment is created in which you can refer to the variables
in your data frame without the "kc$" prefix.
(see ?attach)


--- Bob Green <bgreen at dyson.brisnet.org.au> wrote:
> Hello,
> 
> I am seeking advice regarding how I might add the prefix " kc$ "
to
> variables in  a series of commands. The complication is that there is 
> a large number of variables with different commands. Examples of the 
> variables in typical commands follow.
> 
> It is simple to use search & replace for common variables such as 
> "group" but I would appreciate advice about whether there is a 
way
> to readily alter the remaining variables.
> 
> Bob Green
> 
> 
> CrossTable(group,TOC2,chisq=TRUE,resid=TRUE, missing.include=FALSE)
> fisher.test(group,TOC2)
> 
> tapply(TOC2,  group,  mean)
> tapply( TOC2,  group, sd)
> 
> oneway.test ( TOC2 ~  group, var.equal=FALSE)
> kruskal.test ( TOC2 ~  group)
> 
> 
> broadcast  ==""
> broadcast   [broadcast  ==""] <- "n"
> CrossTable( group,broadcast   ,chisq=TRUE,resid=TRUE,
> missing.include=FALSE)
> fisher.test(group,broadcast)
> 
> jealous [jealous=="y (not victim)"] = "n"
> jealous==""
> jealous [jealous==""] <- "n"
> jealous==""
> CrossTable(group,jealous ,chisq=TRUE,resid=TRUE, missing.include=FALSE)
> fisher.test(group,jealous)
> 
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 


 
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