From butlerpd at udel.edu  Tue Apr 17 10:36:40 2018
From: butlerpd at udel.edu (Paul Butler)
Date: Tue, 17 Apr 2018 10:36:40 -0400
Subject: [SasView Users] SASView - polyspersity, mean. median
In-Reply-To: <cb43b04e-7f28-c91e-5fe7-9889b45fea7d@kmf.troja.mff.cuni.cz>
References: <cb43b04e-7f28-c91e-5fe7-9889b45fea7d@kmf.troja.mff.cuni.cz>
Message-ID: <CAMF-Q0V3ODX1ytJ0uYUpCnQysLNZjK51m5q99APEMx-2eH_+jQ@mail.gmail.com>

HI Jaroslav and thank you for your email.  Regarding your question, yes SasView reports everything in terms of number distribution (or at least it is supposed to -- let us know if there is an error).  Of course scattering weights things differently  but that is handled by SasView for you because most of us think more easily in terms of the number distribution. 

As for the log normal distribution it is supposed to be returning the x_med not the x_peak as I understand it.

Hope this helps

Paul

On Tue, Apr 17, 2018 at 9:39 AM, Jaroslav Kousal <jarda at kmf.troja.mff.cuni.cz> wrote:
Dear Sir/Madam,
I using now SASView package to analyse SAXS data, thank you for this valueable piece of software.

However, I am not fully sure, which parameter of the lognormal distribution ( http://www.sasview.org/docs/user/sasgui/perspectives/fitting/pd_help.html ) is used in the sphere model ( http://www.sasview.org/docs/user/models/sphere.html ) as "radius".

Is it the x_mean, x_med or x_peak?

The FAQ seems to suggests that "radius" is the "x_mean" and that the distribution itself is a number distribution.
Is this correct?

Best regards
   Jaroslav Kousal

-- 
-----------------------------
Mgr. Jaroslav Kousal, Ph.D.
Charles University
Faculty of Mathematics and Physics
Department of Macromolecular Physics
e-mail: jaroslav.kousal at mff.cuni.cz
tel: +420 95155 2256

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http://lists.sasview.org/cgi-bin/mailman/listinfo/users


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From jarda at kmf.troja.mff.cuni.cz  Tue Apr 17 09:39:35 2018
From: jarda at kmf.troja.mff.cuni.cz (Jaroslav Kousal)
Date: Tue, 17 Apr 2018 15:39:35 +0200
Subject: [SasView Users] SASView - polyspersity, mean. median
Message-ID: <cb43b04e-7f28-c91e-5fe7-9889b45fea7d@kmf.troja.mff.cuni.cz>

Dear Sir/Madam,
I using now SASView package to analyse SAXS data, thank you for this 
valueable piece of software.

However, I am not fully sure, which parameter of the lognormal 
distribution ( 
http://www.sasview.org/docs/user/sasgui/perspectives/fitting/pd_help.html 
) is used in the sphere model ( 
http://www.sasview.org/docs/user/models/sphere.html ) as "radius".

Is it the x_mean, x_med or x_peak?

The FAQ seems to suggests that "radius" is the "x_mean" and that the 
distribution itself is a number distribution.
Is this correct?

Best regards
    Jaroslav Kousal

-- 
-----------------------------
Mgr. Jaroslav Kousal, Ph.D.
Charles University
Faculty of Mathematics and Physics
Department of Macromolecular Physics
e-mail: jaroslav.kousal at mff.cuni.cz
tel: +420 95155 2256

_______________________________________________
users mailing list
users at lists.sasview.org
http://lists.sasview.org/cgi-bin/mailman/listinfo/users