read.table(....)
colnames(c.df)
[1] "id"      "code"    "long"    "lat"     "elev"    "age_obs" "year"   
 [8] "Est_age" "Ht_cm"   "BD_mm"   "CDA_cm"  "CDB_cm"  "growth"  "type"  

### Correlation estimation
cor(age_obs,Ht_cm)
cor(age_obs[type=='SD'],Ht_cm[type=='SD'])	#seedling
cor(age_obs[type=='SPB'],Ht_cm[type=='SPB'])	#sapling
cor(age_obs[type=='T'],Ht_cm[type=='T'])		#tree

cor(age_obs,BD_mm)
cor(age_obs[type=='SD'],BD_mm[type=='SD'])
cor(age_obs[type=='SPB'],BD_mm[type=='SPB'])
cor(age_obs[type=='T'],BD_mm[type=='T'])

cor(age_obs,CDA_cm)
cor(age_obs[type=='SD'],CDA_cm[type=='SD'])
cor(age_obs[type=='SPB'],CDA_cm[type=='SPB'])
cor(age_obs[type=='T'],CDA_cm[type=='T'])

cor(age_obs,CDB_cm)
cor(age_obs[type=='SD'],CDB_cm[type=='SD'])
cor(age_obs[type=='SPB'],CDB_cm[type=='SPB'])
cor(age_obs[type=='T'],CDB_cm[type=='T'])

cor(Ht_cm,BD_mm)
cor(Ht_cm[type=='SD'],BD_mm[type=='SD'])
cor(Ht_cm[type=='SPB'],BD_mm[type=='SPB'])
cor(Ht_cm[type=='T'],BD_mm[type=='T'])

cor(Ht_cm,CDA_cm)
cor(Ht_cm[type=='SD'],CDA_cm[type=='SD'])
cor(Ht_cm[type=='SPB'],CDA_cm[type=='SPB'])
cor(Ht_cm[type=='T'],CDA_cm[type=='T'])

cor(Ht_cm,CDB_cm)
cor(Ht_cm[type=='SD'],CDB_cm[type=='SD'])
cor(Ht_cm[type=='SPB'],CDB_cm[type=='SPB'])
cor(Ht_cm[type=='T'],CDB_cm[type=='T'])

cor(BD_mm,CDA_cm)
cor(BD_mm[type=='SD'],CDA_cm[type=='SD'])
cor(BD_mm[type=='SPB'],CDA_cm[type=='SPB'])
cor(BD_mm[type=='T'],CDA_cm[type=='T'])

cor(BD_mm,CDB_cm)
cor(BD_mm[type=='SD'],CDB_cm[type=='SD'])
cor(BD_mm[type=='SPB'],CDB_cm[type=='SPB'])
cor(BD_mm[type=='T'],CDB_cm[type=='T'])

cor(CDA_cm,CDB_cm)
cor(CDA_cm[type=='SD'],CDB_cm[type=='SD'])
cor(CDA_cm[type=='SPB'],CDB_cm[type=='SPB'])
cor(CDA_cm[type=='T'],CDB_cm[type=='T'])

cor(age_obs,Est_age,use="pairwise.complete.obs")
cor(age_obs[type=='SD'],Est_age[type=='SD'],use="pairwise.complete.obs")
cor(age_obs[type=='SPB'],Est_age[type=='SPB'],use="pairwise.complete.obs")
cor(age_obs[type=='T'],Est_age[type=='T'],use="pairwise.complete.obs")


###   table looks like below one

parameters		combined	seedling		sapling		tree
age_obs	Vs Ht_cm				
age_obs	Vs BD_mm				
age_obs	Vs CDA_cm				
age_obs	Vs CDB_cm				
Ht_cm	Vs BD_mm				
Ht_cm	Vs CDA_cm				
Ht_cm	Vs CDB_cm				
BD_mm	Vs CDA_cm				
BD_mm	Vs CDB_cm				
CDA_cm	Vs CDB_cm				
age_obs	Vs est_age