Displaying 5 results from an estimated 5 matches for "inj".
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2004 Oct 26
1
indexing within the function "aggregate"
....82, 15.79, 15.81, 15.82,
15.86, 15.77, 15.86, 15.99, 15.95, 16.01,
15.86, 15.80, 15.87, 15.91, 15.85, 15.84,
15.97, 15.92, 15.87, 15.81, 15.89, 15.90,
15.93, 15.94, 15.91, 15.95, 15.92, 15.93),
expand.grid(INJ = factor(1:3),
VIAL = factor(1:4),
STD = c("EXT","INT"),
SEQUENCE = factor(1:2)))
representing the outcome of an HPLC analysis (PPM)
as from
2 sessions (SEQUENCE) in which
2 methods were used...
2003 Mar 24
1
negative binomial regression
I would like to know if it is possible to perform negative binomial
regression with rate data (incidence density) using the glm.nb (in
MASS) function.
I used the poisson regression glm call to assess the count of injuries
across census tracts. The glm request was adjusted to handle the data
as rates using the offset parameter since the population of census
tracts can vary by a factor of three.
eg. Call:
glm(formula = inj ~ lp + rdm, family = poisson(), data = ww,
offset = log(pop))
Deviance Residual...
2005 Mar 30
1
fastbw question
...I
go to the help for fastbw (and also look in Frank's book Regression
Modeling Strategies) it appears that fastbw should work with a model
created with lm.....
Relevant code
<<<<<
model.borrow.logols<- lm(logborrow~age + sex + racgp + yrseduc +
needlchg + gallery + totni + inject + poly(year.of.int,3) + druginj
+ inj.years + HTLV3)
fastbw(model.borrow.logols)
>>>>
Thanks in advance
Peter
Peter L. Flom, PhD
Assistant Director, Statistics and Data Analysis Core
Center for Drug Use and HIV Research
National Development and Research Institutes
71 W. 23rd S...
2004 Oct 08
1
polr and optim question
Hello again
I am trying to fit an ordinal logistic model using the polr function
from MASS. When I run
model.loan.ordinal <- polr(loancat~age + sex + racgp + yrseduc +
needlchg + gallery + sniffball + smokeball + sniffher +
smokeher + nicocaine + inject + poly(year.of.int,3) + druginj +
inj.years)
I get an error
Error in optim(start, fmin, gmin, method = "BFGS", hessian = Hess, ...)
:
non-finite value supplied by optim
I checked in the MASS book, and in John Fox's book An R and S-Plus
Companion to Applied Regressio...
2010 Mar 12
7
sqldf not joining all the fields
...;NA> <NA> <NA>
6 NULL TSF NULL <NA> <NA> <NA>
7 NULL TSF NULL <NA> <NA> <NA>
8 NULL TSF NULL GAMMABULIN INJ 320MG
9 NULL TSF NULL <NA> <NA> <NA>
10 NULL TSF NULL <NA> <NA> <NA>
bnf_code
1 <NA>
2 13.4.1.2
3 <NA>
4 <NA>
5 <NA>
6...