[R-sig-ME] Error in LME4

[Hans Ekbrand]

On Sun, Jun 08, 2014 at 01:59:07AM +0530, Sunil Mundra wrote:
> Hello all,I am new to use LME4 for analysing mixed effect model.I am trying to test impact of Deep-snow treatment, sampling round, and sampling depth on fungal richness.In my experiment:I have two block (C and D), each Block has 3 fence group.I have two treatment one is where snow is deep (causing soil warming) and other in control sample, at each fence.Samples are collected 9 times in summer from two different depth (2cm and 5cm).I hope i am able to explain my experiment well...
> My first question the the model I am using (see below) here, is OK for this question? Z1 <- lmer(Richness ~ Treatment*Round*Depth + (1|Block/Fence/Treatment/Round), REML= FALSE, data = data)

You don't need to specify wether your data is nested or crossed, lme4
will figure out that anyway. If you want random intercepts try:

Z1 <- lmer(Richness ~ Treatment*Round*Depth + (1|Block) + (1|Fence) + (1|Treatment) + (1|Round), REML= FALSE, data = data)

If you want random slopes, I think you need to explain what you want
better.