Displaying 6 results from an estimated 6 matches for "walker_probsamplereplace".
2019 Feb 19
2
bias issue in sample() (PR 17494)
...to allowing the old behavior to be selected
- make the new behavior the default
- adjust documentation
- ???
Unfortunately I don't have enough free cycles to do this, but I can
help if someone else can take the lead.
There are two other places I found that might suffer from the same
issue, in walker_ProbSampleReplace (pointed out bu O & S) and in
src/nmath/wilcox.c. Both can be addressed by using R_unif_index. I
have done that for walker_ProbSampleReplace, but the wilcox change
might need adjusting to support the standalone math library and I
don't feel confident enough I'd get that right.
Best,...
2019 Feb 26
2
bias issue in sample() (PR 17494)
...e default
>> - adjust documentation
>> - ???
>>
>> Unfortunately I don't have enough free cycles to do this, but I can
>> help if someone else can take the lead.
>>
>> There are two other places I found that might suffer from the same
>> issue, in walker_ProbSampleReplace (pointed out bu O & S) and in
>> src/nmath/wilcox.c. Both can be addressed by using R_unif_index. I
>> have done that for walker_ProbSampleReplace, but the wilcox change
>> might need adjusting to support the standalone math library and I
>> don't feel confident eno...
2019 Feb 26
1
bias issue in sample() (PR 17494)
...t; - ???
>>>>
>>>> Unfortunately I don't have enough free cycles to do this, but I can
>>>> help if someone else can take the lead.
>>>>
>>>> There are two other places I found that might suffer from the same
>>>> issue, in walker_ProbSampleReplace (pointed out bu O & S) and in
>>>> src/nmath/wilcox.c.? Both can be addressed by using R_unif_index. I
>>>> have done that for walker_ProbSampleReplace, but the wilcox change
>>>> might need adjusting to support the standalone math library and I
>>>&...
2019 Feb 20
0
bias issue in sample() (PR 17494)
...> - make the new behavior the default
> - adjust documentation
> - ???
>
> Unfortunately I don't have enough free cycles to do this, but I can
> help if someone else can take the lead.
>
> There are two other places I found that might suffer from the same
> issue, in walker_ProbSampleReplace (pointed out bu O & S) and in
> src/nmath/wilcox.c. Both can be addressed by using R_unif_index. I
> have done that for walker_ProbSampleReplace, but the wilcox change
> might need adjusting to support the standalone math library and I
> don't feel confident enough I'd get...
2019 Feb 26
0
bias issue in sample() (PR 17494)
...documentation
>>> - ???
>>>
>>> Unfortunately I don't have enough free cycles to do this, but I can
>>> help if someone else can take the lead.
>>>
>>> There are two other places I found that might suffer from the same
>>> issue, in walker_ProbSampleReplace (pointed out bu O & S) and in
>>> src/nmath/wilcox.c.? Both can be addressed by using R_unif_index. I
>>> have done that for walker_ProbSampleReplace, but the wilcox change
>>> might need adjusting to support the standalone math library and I
>>> don't fe...
2018 Sep 19
2
Bias in R's random integers?
It doesn't seem too hard to come up with plausible ways in which this could
give bad results. Suppose I sample rows from a large dataset, maybe for
bootstrapping. Suppose the rows are non-randomly ordered, e.g. odd rows are
males, even rows are females. Oops! Very non-representative sample,
bootstrap p values are garbage.
David
On Wed, 19 Sep 2018 at 21:20, Duncan Murdoch <murdoch.duncan