Hi everyone

I am new to the list and read all the instructions, hope i get it right.

I have the following linear model:


model_sqrt<-lm(sqrt(mortality)~richness
               +Acer_davidii+Ailanthus_altissima+Alniphyllum_fortunei
               +Betula_luminifera+Castanea_henryi+Castanopsis_carlesii
               +Castanopsis_eyrei+Castanopsis_fargesii+Castanopsis_sclerophylla
               +Celtis_biondii+Choerospondias_axillaris+Cinamomum_camphora
               +Cyclobalanopsis_glauca+Cyclobalanopsis_myrsinifolia+Diospyros_glaucifolia
               +Elaeocarpus_chinensis+Elaeocarpus_glabripetalus+Elaeocarpus_japonicus
               +Idesia_polycarpa+Koelreuteria_bipinnata+Liquidambar_formosana
               +Lithocarpus_glaber+Machilus_grijsii+Machilus_leptophylla
               +Machilus_thunbergii+Manglietia_yuyuanensis+Melia_azedarach+Meliosma_flexuosa
               +Nyssa_sinensis+Phoebe_bournei+Quercus_acutissima+Quercus_fabri
               +Quercus_phillyreoides+Quercus_serrata+Rhus_chinensis+Sapindus_mukorossi
               +Sapium_discolor+Sapium_sebiferum+Schima_superba
	       +community
,weights=wei)




Where everything from Acer_davidii to Schima_superba are plant species. Since the order of the plant species matters in my case, I want to repeatedly fit the model so that every species is in the first place, that is after the richness term, once.

I am looking for a way so that I don't have to do this by hand. I already checked combn with as.formula and paste, but I couldn't get it right.

I'd be very grateful for any help.


Thanks


David


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