Regsubsets()

Dear List members

I am using the regsubsets function to select a few predictor variables
using Mallow's Cp:

sel.proc.regsub.full <- regsubsets(CO2 ~ v + log(v) + v.max + sd.v +

tad + no.stops.km + av.stop.T + a + sd.a + a.max + d + sd.d + d.max +
RPA + P + perc.stop.T + perc.a.T + perc.d.T + RPS + RPSS + sd.P.acc +
P.dec + da.acc.1 + RMSACC + RDI + RPSI + P.acc + cov.v + cov.a + cov.d +
sd.P + sd.v.run + RCS + T + mass.fin, data = DATASET, weights = count,
nbest = 10, nvmax = 35, method = "exhaustive")

I do however encounter the following warning message which I do not
understand:

Reordering variables and trying again:

Warning messages:
1: 14  linear dependencies found in: leaps.setup(x, y, wt = wt, nbest =
nbest, nvmax = nvmax, force.in = force.in,
2: XHAUST returned error code -999 in: leaps.exhaustive(a, really.big



Could anyone please direct me towards the possible problem and its
solution?

The DATASET consists of 75 datapoints, 35 numeric predictor variables
and the weights vector is given by:

count

[1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1


Many thanks,
Robin Smit





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