Displaying 2 results from an estimated 2 matches for "leachdata".
2008 Jun 05
1
choosing an appropriate linear model
...ent, the amount of rainfall was
recorded as well as the amount of preservative chemical leached. A number
of climatic variables were measured, but the most important is the amount of
rainfall.
I have tried a simple linear model, with zero intercept because zero
rainfall cannot cause any leaching (leachdata dataframe is attached to this
email). The diagnostics show clearly non-normally distributed residuals
with a simple linear regression, and I am trying to figure out what to do
about it (see attached diagnostics.png). This dataset contains measurements
from 57 rainfall events on three replicate sa...
2008 Jun 06
6
Subsetting to unique values
I want to take the first row of each unique ID value from a data frame.
For instance
> ddTable <-
data.frame(Id=c(1,1,2,2),name=c("Paul","Joe","Bob","Larry"))
I want a dataset that is
Id Name
1 Paul
2 Bob
> unique(ddTable)
Will give me all 4 rows, and
> unique(ddTable$Id)
Will give me c(1,2), but not accompanied by the name column.