Displaying 6 results from an estimated 6 matches for "drug3".
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2012 Nov 29
2
Analysis of Variance
...ta=example12_7)
summary(res1)
Df Sum Sq Mean Sq F value Pr(>F)
drug 1 7.96 7.964 2.417 0.138
Residuals 17 56.01 3.294
Note these do not agree with above. However, if I enter the data by hand:
Drug1=c(7.3,8.2,10.1,6.0,9.5)
Drug2=c(7.1,10.6,11.2,9.0,8.5,10.9,7.8)
Drug3=c(5.8,6.5,8.8,4.9,7.9,8.5,5.2)
boxplot(Drug1,Drug2,Drug3)
Then create a dataframe:
d=stack(list(Drug1=Drug1,Drug2=Drug2,Drug3=Drug3))
And run aov again:
res=aov(values~ind,data=d)
summary(res)
I get these results:
Df Sum Sq Mean Sq F value Pr(>F)
ind 2 21.98 10.991...
2008 Jul 04
1
Repeated measures lme or anova
...ctable level.
I'm look for individual and combined effects of Group and Drug.
There are ~400 metabolites which I intend to test independently. (I know that will leave me with a multiple testing issue)
What I've worked out for lme is
> summary(test.lme <- lme(Value ~ Group*Drug1*Drug2*Drug3 - 1, test,random = ~1|Patient))
> anova(test.lme)
and for anova is
> summary(aov(Value~(Group*Drug1*Drug2*Drug3)+Error(Patient/(Drug1*Drug2*Drug3)),test))
The full structure of the 'test' data table for one metabolite is below.
Thanks for your time and any thoughts you may have.
A...
2011 Feb 08
1
Just another pattern matching / indexing question
...in a model.
I've tried grep, to search along the rows, and I can generate a vector of
identifiers, but I cannot seem to generate the vector of logicals.
I realise I'm doing something simply wrong.
names(drugindex)
[1] "book.MRN" "DRUG1" "DRUG2" "DRUG3" "DRUG4" "DRUG5"
[7] "DRUG6" "DRUG7" "DRUG8" "DRUG9" "DRUG10" "DRUG11"
[13] "DRUG12" "DRUG13" "DRUG14" "DRUG15" "DRUG16"
> t...
2013 Feb 17
2
nested random factor using lme produces errors
...l=lme(parasite~drug,random=~1|drug/family)
But doing a summary on this model gives me warning message :
In pt(-abs(tTable[, "t-value"]), tTable[, "DF"]) : NaNs produced
I don't understand why ?! I noticed that the p-values are not computed and
have NAs values for drug2 and drug3 (from the summary of this model)
Moreover, in the summary, I noticed that in the random effects line I have
standard deviation for Formula: ~1 | drug and for Formula: ~1 | family %in%
drug. Does R consider drug as a random factor as well ?
And last question, how can I know if my random factor has...
2011 Sep 28
1
number of items to replace is not a multiple of replacement length
Please help with this error message
drugbook is an 885 x 32 dataframe
>names(drugbook)
[1] "DRUG1" "DRUG2" "DRUG3" "DRUG4" "DRUG5"
[6] "DRUG6" "DRUG7" "DRUG8" "DRUG9" "DRUG10"
[11] "DRUG11" "DRUG12" "DRUG13" "DRUG14" "DRUG15"
[1...
2010 Jul 05
3
adding a row of names to data.frame
Relative noob here, I have a data.frame and simply want to add an explicit column of names in column 1 of the form
"trial_number01" for row 1, "trial_number02" for row 2 .... etc. It is simply for visual purposes and to explain data to others. I've tried
Using row.names and other but still no luck, am sure it has been covered but I can't find it, can you please point