The reason for pointing out the FAQ: What's a reproducible example (`reprex`) and how do I do one? was to emphasize how difficult it can be to formulate an answer without a reprex, such as this example from the plm help page
library(plm)
data("Produc", package = "plm")
zz <- plm(log(gsp) ~ log(pcap) + log(pc) + log(emp) + unemp,
data = Produc, index = c("state","year"))
summary(zz)
#> Oneway (individual) effect Within Model
#>
#> Call:
#> plm(formula = log(gsp) ~ log(pcap) + log(pc) + log(emp) + unemp,
#> data = Produc, index = c("state", "year"))
#>
#> Balanced Panel: n = 48, T = 17, N = 816
#>
#> Residuals:
#> Min. 1st Qu. Median 3rd Qu. Max.
#> -0.120456 -0.023741 -0.002041 0.018144 0.174718
#>
#> Coefficients:
#> Estimate Std. Error t-value Pr(>|t|)
#> log(pcap) -0.02614965 0.02900158 -0.9017 0.3675
#> log(pc) 0.29200693 0.02511967 11.6246 < 2.2e-16 ***
#> log(emp) 0.76815947 0.03009174 25.5273 < 2.2e-16 ***
#> unemp -0.00529774 0.00098873 -5.3582 1.114e-07 ***
#> ---
#> Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
#>
#> Total Sum of Squares: 18.941
#> Residual Sum of Squares: 1.1112
#> R-Squared: 0.94134
#> Adj. R-Squared: 0.93742
#> F-statistic: 3064.81 on 4 and 764 DF, p-value: < 2.22e-16
Created on 2020-03-07 by the reprex package (v0.3.0)