DATA:      van Dobben, ter Braak et Dirkse (1998)
DIRECTORY: \CANOCO\SAMPLES\PERMUTIO\E40
PROBLEM:   Effect of N- and P-addition on the undergrowth in pine forest
ILLUSTRATION OF:
+ how to analyse a factorial experiment
+ how to construct a (multivariate) analysis of variance table in CANOCO
+ how to test an interaction effect
+ how to test a main effect
+ how to specify permutation blocks from covariables in the command version 
  of CANOCO
_______________________________________________________________________________
FILE TYPE    |  FILE NAME    |         DESCRIPTION
-------------+---------------+-------------------------------------------------
 SPECIES     | E40_spec.dta  | 103 plant species (cover percentages) in 32 
             |               |  plots in experiment E40
ENVIRONMENT  | E40_dsgn.dta  | dummy variables coding for 4 blocks, 4 levels 
             |               |  of N and 2 levels of P of the N*P factorial
             |               |  experiment in 4 blocks
 PROJECTS    | e40_nxp.con   | RDA of treatment groups, model N*P adjusted for
             |               |  blocks
             | e40_np.con    | test of the interaction effect N.P, adjusted 
             |               |  for N, P and blocks
             | e40_n.con     | test of effect of N, adjusted for P and blocks
             | e40_p.con     | test of effect of P, adjusted for N and blocks
             | e40_nap.con   | parsimonious model, N + P, adjusted for blocks
             | n_design.con  | design-based permutation ý la Edgington to test
             |               |  the N effect
             | p_design.con  | idem to test the P effect
             | e40_err.con   | (error) project of the command version of CANOCO
             |               |  in which covariables are in the wrong order to
             |               |  define blocks; this error cannot occur 
             |               |  in the windows version
-------------+---------------+-------------------------------------------------

Experiment E40 was done in Lisselbo, Sweden (Tamm et al. 1974).

Tamm, C.O., Nillson, A., Wiklander, G.(1974): The optimum nutrition
experiment Lisselbo. A brief description of an experiment in a young
stand of Scots Pine (Pinus sylvestris L.) Report Royal College of
Forestry 18, 25 p. Stockholm.

Van Dobben, H.F., Ter Braak, C.J.F., Dirkse, G.M. (1998):
Undergrowth as a biomonitor for deposition of nitrogen and acidity
in pine forest. Forest Ecology and management

See also: 
Tamm, C.O., Popovic, B.(1995): Long-term field experiments simulating
  increased deposition of sulphur and nitorgen to forest plots. 
  Ecological Bulletins (44) pp. 3-1-321