https://gist.github.com/3900314 label: statistical tests and options that are missing in scipy and statsmodels. Josef
On Tue, Oct 16, 2012 at 6:25 PM, <josef.pktd@gmail.com> wrote:
https://gist.github.com/3900314
label: statistical tests and options that are missing in scipy and statsmodels.
Is this a "how many incomprehensibly named t-test functions can we create" exercise? (only half kidding) Ralf
On Tue, Oct 16, 2012 at 12:31 PM, Ralf Gommers <ralf.gommers@gmail.com> wrote:
On Tue, Oct 16, 2012 at 6:25 PM, <josef.pktd@gmail.com> wrote:
https://gist.github.com/3900314
label: statistical tests and options that are missing in scipy and statsmodels.
Is this a "how many incomprehensibly named t-test functions can we create" exercise?
(only half kidding)
TOST is a long established name in statistics exercise: look at how much SAS TTEST can do http://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer... and ours are ... <limited> (mainly a contribution to: statistically significant difference versus is there an "important" difference) Josef
Ralf
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On Tue, Oct 16, 2012 at 6:46 PM, <josef.pktd@gmail.com> wrote:
On Tue, Oct 16, 2012 at 12:31 PM, Ralf Gommers <ralf.gommers@gmail.com> wrote:
On Tue, Oct 16, 2012 at 6:25 PM, <josef.pktd@gmail.com> wrote:
https://gist.github.com/3900314
label: statistical tests and options that are missing in scipy and statsmodels.
Is this a "how many incomprehensibly named t-test functions can we
create"
exercise?
(only half kidding)
TOST is a long established name in statistics
exercise: look at how much SAS TTEST can do
http://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer... and ours are ... <limited>
It can do more than what's in scipy.stats, I know. There's one function TTEST in SAS though, with some keywords to control behavior. I'm all for adding more useful functionality, but against more small functions with names that will be meaningless for the vast majority of users. Ralf
On Tue, Oct 16, 2012 at 2:24 PM, Ralf Gommers <ralf.gommers@gmail.com> wrote:
On Tue, Oct 16, 2012 at 6:46 PM, <josef.pktd@gmail.com> wrote:
On Tue, Oct 16, 2012 at 12:31 PM, Ralf Gommers <ralf.gommers@gmail.com> wrote:
On Tue, Oct 16, 2012 at 6:25 PM, <josef.pktd@gmail.com> wrote:
https://gist.github.com/3900314
label: statistical tests and options that are missing in scipy and statsmodels.
Is this a "how many incomprehensibly named t-test functions can we create" exercise?
(only half kidding)
TOST is a long established name in statistics
exercise: look at how much SAS TTEST can do
http://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer... and ours are ... <limited>
It can do more than what's in scipy.stats, I know. There's one function TTEST in SAS though, with some keywords to control behavior. I'm all for adding more useful functionality, but against more small functions with names that will be meaningless for the vast majority of users.
SAS is using big Procedures for most things. Unless a user looks for something known, most of these names are completely uninformative bartlett, levene, mood, spearmanr, mannwhitneyu, ... (I never heard of most of them, before working my way through it.) example http://rgm2.lab.nig.ac.jp/RGM2/functions.php?show=all&query=package:lmtest I tried to put a descriptive prefix on some of the tests http://statsmodels.sourceforge.net/devel/stats.html#residual-diagnostics-and... I haven't figured out a good pattern yet for combining tests in the direction of the SAS style. the name for TOST should be ``equivalence_test`` or something similar. The main helpful information are pages about when to use which tests. my specific page http://statsmodels.sourceforge.net/devel/diagnostic.html#diagnostics for general 1 sample, 2 sample and k sample tests overview tables are available on the internet. Josef
Ralf
_______________________________________________ SciPy-User mailing list SciPy-User@scipy.org http://mail.scipy.org/mailman/listinfo/scipy-user
On Tue, Oct 16, 2012 at 3:38 PM, <josef.pktd@gmail.com> wrote:
On Tue, Oct 16, 2012 at 2:24 PM, Ralf Gommers <ralf.gommers@gmail.com> wrote:
On Tue, Oct 16, 2012 at 6:46 PM, <josef.pktd@gmail.com> wrote:
On Tue, Oct 16, 2012 at 12:31 PM, Ralf Gommers <ralf.gommers@gmail.com> wrote:
On Tue, Oct 16, 2012 at 6:25 PM, <josef.pktd@gmail.com> wrote:
https://gist.github.com/3900314
label: statistical tests and options that are missing in scipy and statsmodels.
Is this a "how many incomprehensibly named t-test functions can we create" exercise?
(only half kidding)
TOST is a long established name in statistics
exercise: look at how much SAS TTEST can do
http://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer... and ours are ... <limited>
to continue in R:
t.test(var1 ~ fact, data=clinic, mu=-0.6, alternative="greater")
Welch Two Sample t-test data: var1 by fact t = 3.0205, df = 26.748, p-value = 0.002749 alternative hypothesis: true difference in means is greater than -0.6 95 percent confidence interval: -0.2666863 Inf sample estimates: mean in group 1 mean in group 2 3.498000 3.333333 scipy.stats.ttest_ind is missing a ``mu`` argument, difference in mean to test Without it, an equivalence test for independent samples cannot be simply written on top of it. volunteers? Josef another TOST --------------- tost {equivalence} R Documentation Computes a TOST for equivalence from paired or unpaired data Description This function computes the test and key test quantities for the two one-sided test for equivalence, as documented in Schuirmann (1981) and Westlake (1981). This function computes the test for a sample of paired differences or two samples, assumed to be from a normally-distributed population. Usage tost(x, y = NULL, alpha = 0.05, epsilon, ...) ----------------
It can do more than what's in scipy.stats, I know. There's one function TTEST in SAS though, with some keywords to control behavior. I'm all for adding more useful functionality, but against more small functions with names that will be meaningless for the vast majority of users.
SAS is using big Procedures for most things.
Unless a user looks for something known, most of these names are completely uninformative bartlett, levene, mood, spearmanr, mannwhitneyu, ... (I never heard of most of them, before working my way through it.)
example http://rgm2.lab.nig.ac.jp/RGM2/functions.php?show=all&query=package:lmtest
I tried to put a descriptive prefix on some of the tests http://statsmodels.sourceforge.net/devel/stats.html#residual-diagnostics-and...
I haven't figured out a good pattern yet for combining tests in the direction of the SAS style.
the name for TOST should be ``equivalence_test`` or something similar.
The main helpful information are pages about when to use which tests. my specific page http://statsmodels.sourceforge.net/devel/diagnostic.html#diagnostics
for general 1 sample, 2 sample and k sample tests overview tables are available on the internet.
Josef
Ralf
_______________________________________________ SciPy-User mailing list SciPy-User@scipy.org http://mail.scipy.org/mailman/listinfo/scipy-user
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Ralf Gommers