Re: Pearson-r in SQL
Date: Fri, 24 Dec 2004 01:25:10 +0100
Message-ID: <f6oms0heulhqar17hlfnbgqhdpgaj0s6bs_at_4ax.com>
On Thu, 23 Dec 2004 15:00:51 -0800, Gene Wirchenko
<genew_at_mail.ocis.net> wrote:
>"-CELKO-" <jcelko212_at_earthlink.net> wrote:
>
>>Add more data to the set, drop the columns with NULLs and now I can get
>>a result. For example with four more rows:
>>
>>(3kg, 6m)
>>(5kg, 10m)
>>(7kg, 14m)
>>(1kg, 2m)
>>
>>my known values are linear. But I have those other rows of partial
>>data that should reduce my confidence that I really have (r = 1). I
>
> Why? The partial data does not say anything either way.
>
>>just don't know what the SQL products like CA-Ingres are doing with
>>this, nor what statistics would do with it.
>
> I would toss it. It is not valid data.
[...]
What if the cost of getting one measurement was, say 37000 Dollars? Even if you could get only the x result and not the desired (x, y) pair, due to some experimental mishap?
Greetings
Matthias Kläy
-- www.kcc.chReceived on Fri Dec 24 2004 - 01:25:10 CET