How do you load a function into R?

General
1

how do you load function "pmg" onto R?

2

The pmg function appears to be from the plm R package.

If you haven't already, first you need to install the plm package to your local machine.

# first, you need to install the package 
# that has this function onto your machine
# once you've done this one, you don't need to do it again, 
# (unless, possibly, if you upgrade R or other packages that interact with it)
install.packages('plm')

Then, you can load the package, and use the pmg function.

#this loads the plm package
# which gives you acces to the pmg function
library(plm)
#> Loading required package: Formula

# for example, from help(plm) examples: 
data("Produc", package = "plm")
## Mean Groups estimator
mgmod <- pmg(log(gsp) ~ log(pcap) + log(pc) + log(emp) + unemp, data = Produc)
summary(mgmod)
#> Mean Groups model
#> Call:
#> pmg(formula = log(gsp) ~ log(pcap) + log(pc) + log(emp) + unemp, 
#>     data = Produc)
#> 
#> Balanced Panel: n = 48, T = 17, N = 816
#> 
#> Residuals:
#>       Min.    1st Qu.     Median       Mean    3rd Qu.       Max. 
#> -0.0828079 -0.0118150  0.0004247  0.0000000  0.0126479  0.1189647 
#> 
#> Coefficients:
#>               Estimate Std. Error z-value  Pr(>|z|)    
#> (Intercept)  2.6722392  0.4126515  6.4758 9.433e-11 ***
#> log(pcap)   -0.1048507  0.0799132 -1.3121   0.18950    
#> log(pc)      0.2182539  0.0500862  4.3576 1.315e-05 ***
#> log(emp)     0.9334776  0.0750072 12.4452 < 2.2e-16 ***
#> unemp       -0.0037216  0.0016427 -2.2655   0.02348 *  
#> ---
#> Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
#> Total Sum of Squares: 849.81
#> Residual Sum of Squares: 0.33009
#> Multiple R-squared: 0.99961

Created on 2018-09-28 by the reprex package (v0.2.1)

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3

I get the message “package ‘pmg’ is not available (for R version 3.5.1)”

4

That error suggests that you're trying to install a package called pmg (which doesn't exist), i.e., you probably executed

install.packages('pmg')

As Curtis noted, the function pmg is part of the package plm, so you need to install plm, not pmg. Just execute

install.packages('plm')

at the console prompt and you won't get that error anymore.

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