* statistical operations with org-mode?
@ 2015-03-27 14:23 Jude DaShiell
2015-03-29 20:51 ` Nick Dokos
0 siblings, 1 reply; 2+ messages in thread
From: Jude DaShiell @ 2015-03-27 14:23 UTC (permalink / raw)
To: emacs-orgmode
After having read through the org-mode info on spreadsheets several times
and having also read through the calc info a few times I have not ben able
to get pstdev() to produce anything but errors. Having checked over the
data in a table, I found a couple instances where data values were missing
so I expect this could account for the errors by itself. In column 3 I
put the formula =pstdev(@<..@>) and also tried with =pstdev($3). What is
the correct syntax? I wasn't sure which if any would work after having
done all of that reading.
-- Twitter: JudeDaShiell
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: statistical operations with org-mode?
2015-03-27 14:23 statistical operations with org-mode? Jude DaShiell
@ 2015-03-29 20:51 ` Nick Dokos
0 siblings, 0 replies; 2+ messages in thread
From: Nick Dokos @ 2015-03-29 20:51 UTC (permalink / raw)
To: emacs-orgmode
Jude DaShiell <jdashiel@panix.com> writes:
> After having read through the org-mode info on spreadsheets several
> times and having also read through the calc info a few times I have
> not ben able to get pstdev() to produce anything but errors. Having
> checked over the data in a table, I found a couple instances where
> data values were missing so I expect this could account for the errors
> by itself. In column 3 I put the formula =pstdev(@<..@>) and also
> tried with =pstdev($3). What is the correct syntax? I wasn't sure
> which if any would work after having done all of that reading.
>
AFAIK, the sample standard deviation calc function for a vector is called vsdev
and the population standard deviation is called vpsdev.
Here is an example of calling them (as well as the vmean and vmedian
functions):
--8<---------------cut here---------------start------------->8---
* Calculate stats on a column
| seqno | value | |
|-------+------------+------------|
| 1 | 0.34437004 | 0.49622740 |
| 2 | 0.65321163 | 0.49569043 |
| 3 | 0.17841555 | 0.22716774 |
| 4 | 0.28259230 | |
| 5 | 0.88476454 | |
| 6 | 0.65279340 | |
| 7 | 0.12817118 | |
| 8 | 0.50326488 | |
| 9 | 0.34985056 | |
| 10 | 0.78586253 | |
| 11 | 0.49569043 | |
| 12 | 0.46154064 | |
| 13 | 0.65004499 | |
| 14 | 0.74102345 | |
| 15 | 0.33181485 | |
#+TBLFM: @2$3 = vmean(@2$2..@>$2) :: @3$3 = vmedian(@2$2..@>$2) :: @4$3 = vsdev(@2$2..@>$2) :: @5$3 = vpsdev(@2$2..@>$2)
--8<---------------cut here---------------end--------------->8---
HTH.
--
Nick
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