On 25/10/20 4:49 am, Meghna Karkera wrote:
Is there any syntax for covariance which uses the unbiased formula
(yi-ymean)*(yj-ymean) /n...Monte Carlo method
I think you have "biased" and "unbiased" backwards. The formula
with n-1 is used when you want to calculate an *unbiased* estimate
for a po
If you read the documentation, there's a `bias` bool parameter.
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Is there any syntax for covariance which uses the unbiased formula
(yi-ymean)*(yj-ymean) /n...Monte Carlo method
On Sat, Oct 24, 2020, 21:11 Meghna Karkera wrote:
> Dear Sir
>
> Now I figured out why there was a difference when I manually computed
> covariance and when I use the np. cov syntax i
Dear Sir
Now I figured out why there was a difference when I manually computed
covariance and when I use the np. cov syntax in python.
The formula I used was ((yi-ymean)(yj-ymean))/n...unbiasdness.
The formula np.cov uses is ((yi-ymean)(yj-ymean)) /n-1.
Thanks
Sincerely
Meghna Raviraj Karkera
Hi Meghna,
I organized some tutorials about Machine Learning for Chemistry with Python.
Where you can find some info about the use of Covariance Matrix that may
help you.
The originals are in Portugueese, but you can read using Google Translator:
https://tinyurl.com/yybazx9n
https://tinyurl
Am 19.10.20 um 07:23 schrieb Meghna Karkera:
I am unable to find the *formula for covariance* used in np.cov syntax in
PYTHON given in link
https://numpy.org/doc/stable/reference/generated/numpy.cov.html. Could you
please help me out.
As said, you should click on the link [source] just at the
Dear Sir
I am unable to find the *formula for covariance* used in np.cov syntax in
PYTHON given in link
https://numpy.org/doc/stable/reference/generated/numpy.cov.html. Could you
please help me out.
Thanks
Meghna
On Tue, Oct 13, 2020 at 11:46 AM Christian Gollwitzer
wrote:
> Am 13.10.20 um 06
I think the np.cov is from the numpy module (imported/aliased as np?).
If so, the numpy repository should have what you are looking for:
https://github.com/numpy/numpy/blob/156cd054e007b05d4ac4829e10a369d19dd2b0b1/numpy/lib/function_base.py#L2276
Hope that helps
Bruno
On Tuesday, 13 October
Am 13.10.20 um 06:52 schrieb Meghna Karkera:
Could you let me know what is the back end calculation of this covariance
matrix syntax np.cov
You can look it up yourself: Go to the docs
https://numpy.org/doc/stable/reference/generated/numpy.cov.html
At the right hand side, just right of the fun
Could you let me know what is the back end calculation of this covariance
matrix syntax np.cov
On Tue, Oct 13, 2020, 10:14 Bruno P. Kinoshita
wrote:
> I think the np.cov is from the numpy module (imported/aliased as np?).
>
> If so, the numpy repository should have what you are looking for:
>
>
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