Displaying 4 results from an estimated 4 matches for "gender2".
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2013 Nov 20
4
How to stop Kaplan-Meier curve at a time point
...an-Meier curve
at my desired time (2190days)or roughly 6 years. However, my question is I
want to find the significance (log rank test) at this time point between
the two curves; because I am not able to find a way to stop the survfit at
this time point with my knowledge. Below is the code I used.
Gender2<-survfit(Surv(Survival_days, Outcome)~Gender)
plot (Gender2, xmax=2190, mark.time=FALSE, col=c(1:2), xlab="Survival time
(Days)", ylab="Survival probability", main="Gender") # mark.time=FALSE will
remove the censoring lines in the graph. If censoring lines are need...
2020 Oct 14
2
which() vs. just logical selection in df
...hank you for your reply! I hadn't heard of the {microbenchmark}
package & was excited to try it! Thank you for the suggestion! I did
check the reference source for which() beforehand, which included the
statement to remove NAa, and I didn't have any missing values or NAs:
sum(is.na(dat$gender2))
sum(is.na(dat$gender))
sum(is.na(dat$y))
[1] 0
[1] 0
[1] 0
I still had a 10ms difference in the value returned by microbenchmark
between the following methods: one with and one without using which().
The difference is reversed from what I expected, since which() is an
extra step.
microbenchmar...
2020 Oct 10
1
which() vs. just logical selection in df
...ile; 'nrows' is a slight
# overestimate
dat <- dat[,1:3] # select just the first 3 columns
head(dat, 10) # print the first 10 rows
# Select using which() as the final step ~ 90ms total time on my macbook air
system.time(
head(
dat[which(dat$gender2=="other"),],),
gcFirst=TRUE)
# Select skipping which() ~130ms total time
system.time(
head(
dat[dat$gender2=="other", ]),
gcFirst=TRUE)
Now I would think that the second one without which() would be more
efficient. However, every time I run these, the first version,...
2020 Oct 14
0
which() vs. just logical selection in df
Inline.
Bert Gunter
"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Wed, Oct 14, 2020 at 3:23 PM 1/k^c <kchamberln at gmail.com> wrote:
Is which() invoking c-level code by chance, making it slightly faster
> on average?
>
You do not need