[R] loading

farzana akbari farzana.akbari2013 at gmail.com
Sun Mar 27 19:10:35 CEST 2016

 hi I install plm and pglm packages but I  can not load no one of them. the
massage of loading plm is

> library(plm)
Loading required package: Formula

and for pglm is

> library(pglm)
Loading required package: maxLik
Loading required package: miscTools

Please cite the 'maxLik' package as:
Henningsen, Arne and Toomet, Ott (2011). maxLik: A package for maximum
likelihood estimation in R. Computational Statistics 26(3), 443-458. DOI

If you have questions, suggestions, or comments regarding the 'maxLik'
package, please use a forum or 'tracker' at maxLik's R-Forge site:

can you help me? and also when i wanna Formula package there is no massage
. for installing Formula massage is
--- Please select a CRAN mirror for use in this session ---
Warning: package ‘Formula’ is in use and will not be installed

i used  3.1.3  and  3.2.4 ver *64  and  32  and my computer is 64 bit

please help me

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