Displaying 5 results from an estimated 5 matches for "parasitoid".
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parasitoids
2011 Jun 15
2
plot with two y axes BUT unaligned x axis
Hi all,
I have scoured the archives of this forum but nothing quite seems to fit the
bill...
I would like to plot a graph displaying two variables (y axes) that share
date as the x axis. However, the date values for each variable are not the
same - for example, some parasitoids were not released on days that
collections from the trap took place, whilst sometimes releases did occur on
the same day. I would like to align them. My code is:
####
CollectionDate<-as.Date(CollectionDate,"%m/%d/%Y") # days that had
collections
release.date.Total<-as.Date(release...
2006 Sep 13
3
unexpected result in glm (family=poisson) for data with an only zero response in one factor
...ks properly:
mydata[1,2]=1
g=glm(response~traitment, data=mydata, family=poisson)
anova.glm(g,test="Chisq")
summary(g)
##################################################################################### END ##
Antonin Ferry (PhD)
"Laboratoire d'Ecobiologie des Insectes Parasitoides"
http://www.parasitoides.univ-rennes1.fr
Universit? de Renes1, FRANCE
2011 Jun 09
2
Adapting R code for different traps
...My code:
> temp<-outer(release.days,collection.days,'-')
> temp<-ifelse(temp>=0,NA,temp)
> release.diff<-apply(temp,2,max,na.rm=TRUE)
works for one trap and does what I want. That is, it determines the time
difference between the collection date of a trap and date of parasitoid
release immediately before it, excluding releases that occurred on the same
day as the collection.
The code above, however, does not give the correct values - those that I
have calculated for each trap individually. I am wondering how I can adapt
this code for each trap ie. it uses only data assoc...
2011 Jun 03
1
VLOOKUP in R - tried everything.
I am attempting to emulate the VLOOKUP function from Excel in R.
I want to compare one column (coll.minus.release) with another
(release.days) to get the number of parasitoid released at that time
(TotalParasitoids).
for example:
coll.minus.release release.days ParasitoidTotal
-12 -266 1700
8 -259 1000
8 -225 1000
28...
2010 Aug 05
0
multiple comparisons after glm
Dear list members,
I have a question concerning multiple comparisons after using glm.
My response variable is days until emergence of an insect species. The explanatory variables are sex (two levels), parasitoids added (two levels) and populations (34 levels). I would like to know now which populations are different in days until insect emergence.
For this I used multiple comparisons as followed:
model<-glm( daysuntilemergence ~ sex + parasitoidsadded + population, quasipoisson )
glht(model, linfct...