of percent cover data for power
analysis
Hi Brian,
I've been encountering this percent cover issue for a while. Unfortunately
my data was all based on Braun-Blanquet estimates so analysis has been
tricky. I converted to midpoint percent estimates (not strictly legitimate
but served the purpose
Brian
I use arcsin(square root(proportion)) anytime I'm doing analysis of
percent data. The reason may not be justified for the type of simulation
your running, which I'm not familiar with. I use this transformation
since percent data is inherently not normally distributed.
Hello all,
For advice on the use of the arcsin transform, I
recommend the following paper:
http://www.esajournals.org/doi/abs/10.1890/10-0340.1
The title itself is worth poking the link.
David Schneider
Quoting Jordan Marshall marsh...@ipfw.edu:
Brian
I use arcsin(square
Hi Brian,
I've been encountering this percent cover issue for a while. Unfortunately
my data was all based on Braun-Blanquet estimates so analysis has been
tricky. I converted to midpoint percent estimates (not strictly legitimate
but served the purpose) and then had the same problem you did.
Hello ecolog,
I am working on a power analysis simulation for long-term forest monitoring
data, with the goal of documenting our power to detect trends over time.
The simulation is based on a repeated measures hierarchical model, where
future data is simulated based on the initial data set and a
