[R] Question about food sampling analysis

[Richard Weeks]

Hi Sarah,

We regularly undertake work in the food sector and have developed many
custom built solutions. To be more specific, the statistics we employ is
that of sensory analysis and we regularly use the sensominer package in
R.

Regards,

Richard Weeks

Mangosolutions
data analysis that delivers


Mail: rweeks at mango-solutions.com
T: +44 (0)1249 767700
F: +44 (0)1249 767707
M: +44 (0)7500 040365

Unit 2 Greenways Business Park
Bellinger Close
Chippenham
Wilts
SN15 1BN
UK
 

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Sarah Henderson
Sent: 12 July 2010 22:42
To: R List
Subject: [R] Question about food sampling analysis

Greetings to all, and my apologies for a question that is mostly about
statistics and secondarily about R.  I have just started a new job that
(this week, apparently) requires statistical knowledge beyond my
training
(as an epidemiologist).

The problem:

- We have 57 food production facilities in three categories
- Samples of 4-6 different foods were tested for listeria at each
facility
- I need to describe the presence of listeria in food (1) overall and
(2) by
facility category.

I know that samples within each facility cannot be treated as
independent,
so I need an approach that accounts for (1) clustering within facilities
and
(2) the different number of samples taken at each facility.  If someone
could kindly point me towards the right type of analysis for this and/or
its
associated R functions/packages, I would greatly appreciate it.

Many thanks,

Sarah

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