[R] loops in R

[Noha Osman]

Hi Folks

Iam  a new user of R and I have a question . Hopefully anyone help me in that issue


I have that dataset as following

 Sample      Population  Species  Tissue         R         G        B
1 Bari1_062-1      Bari1     ret   seed  94.52303  80.70346 67.91760
2 Bari1_062-2      Bari1     ret   seed  98.27683  82.68690 68.55485
3 Bari1_062-3      Bari1     ret   seed 100.53170  86.56411 73.27528
4 Bari1_062-4      Bari1     ret   seed  96.65940  84.09197 72.05974
5 Bari1_062-5      Bari1     ret   seed 117.62474  98.49354 84.65656
6 Bari1_063-1      Bari1     ret   seed 144.39547 113.76170 99.95633

and I have 20 populations as following

[1] Bari1      Bari2      Bari3      Besev      Cermik     Cudi       Derici     Destek     Egil
[10] Gunasan    Kalkan     Karabace   Kayatepe   Kesentas   Ortanca    Oyali      Cultivated Sarikaya
[19] Savur      Sirnak

I need to calculate mean and variance of each population using column [R] using  for-loop


Thanks

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