R help - May 2009 - SEM:Standard error of std.coef estimates?

Hi,

I am currently working with the sem package in R, to create pathway
diagrams. Id like to use the standardized path coeffcients. To get these, I
use std.coef. However, using this yields only the standardized coefficients,
but does not give me the standard error. Does someone know how to get
std.coef to show the standard error of the standardized path coefficients as
well?


Thanks,
Bastiaan


PS: 
When I use std.coef, all I get is this:

std.coef(path.model.SSI4)
          Std. Estimate                       
par1 par1  0.39499      com_veg <--- tempm    
par2 par2  0.35231      SNutBili <--- tempm   
par3 par3 -0.68170      S_SSI4 <--- tempm     
par4 par4 -0.39145      com_veg <--- Wdeficit 
par5 par5 -0.60025      SNutBili <--- Wdeficit
par6 par6 -0.20562      S_SSI4 <--- Wdeficit  
par7 par7  0.14871      SNutBili <--- com_veg 
par8 par8  0.14905      S_SSI4 <--- com_veg   
par9 par9 -0.39164      S_SSI4 <--- SNutBili  
-- 
View this message in context:
http://www.nabble.com/SEM%3AStandard-error-of-std.coef-estimates--tp23633227p23633227.html
Sent from the R help mailing list archive at Nabble.com.

Dear Bastiaan,

The standard errors of the standardized coefficients aren't simple because
the standard deviations used to standardize the coefficients are also
subject to sampling error. I can think of two ways to get standard errors
for the standardized coefficients: by the delta method and by bootstrapping.
Neither method is implemented in the sem package. Figuring out how to apply
the former would require some work; I'll put it on my to-do list, but may
not get to it. The second approach could easily be implemented via the boot
package.

I hope this helps,
 John

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at
r-project.org]
On
> Behalf Of BdeGroot
> Sent: May-20-09 7:41 AM
> To: r-help at r-project.org
> Subject: [R] SEM:Standard error of std.coef estimates?
> 
> 
> Hi,
> 
> I am currently working with the sem package in R, to create pathway
> diagrams. Id like to use the standardized path coeffcients. To get these,
I
> use std.coef. However, using this yields only the standardized
coefficients,
> but does not give me the standard error. Does someone know how to get
> std.coef to show the standard error of the standardized path coefficients
as
> well?
> 
> 
> Thanks,
> Bastiaan
> 
> 
> PS:
> When I use std.coef, all I get is this:
> 
> std.coef(path.model.SSI4)
>           Std. Estimate
> par1 par1  0.39499      com_veg <--- tempm
> par2 par2  0.35231      SNutBili <--- tempm
> par3 par3 -0.68170      S_SSI4 <--- tempm
> par4 par4 -0.39145      com_veg <--- Wdeficit
> par5 par5 -0.60025      SNutBili <--- Wdeficit
> par6 par6 -0.20562      S_SSI4 <--- Wdeficit
> par7 par7  0.14871      SNutBili <--- com_veg
> par8 par8  0.14905      S_SSI4 <--- com_veg
> par9 par9 -0.39164      S_SSI4 <--- SNutBili
> --
> View this message in context:
http://www.nabble.com/SEM%3AStandard-error-of-
> std.coef-estimates--tp23633227p23633227.html
> Sent from the R help mailing list archive at Nabble.com.
> 
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