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OT Statistics help



 
 
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  #1  
Old February 2nd 04, 11:35 PM
Alison
external usenet poster
 
Posts: n/a
Default OT Statistics help

Hi,
I have to review some data and and I don't understand the term "
back-transformed means " I know it's something to do with averages
but can any one explain it in simple terms (the simpler the beterG)
and how accurate is it?
TIA Alison


  #2  
Old February 3rd 04, 05:27 PM
FurPaw
external usenet poster
 
Posts: n/a
Default

Alison wrote:
Hi,
I have to review some data and and I don't understand the term "
back-transformed means " I know it's something to do with averages
but can any one explain it in simple terms (the simpler the beterG)
and how accurate is it?
TIA Alison


Here's a slide show that gives a brief definition. When the simple
arithmetic mean isn't a good representation of the data, sometimes the data
are transformed (e.g., by taking log10 of each data point), then averaging
the transformed values. The resulting mean is still expressed as a log
value, so it is back-transformed (10 raised to the log value) to give a
geometric mean of the original data set - which normally would be different
than the arithmetic mean.

http://www.plantbio.ohiou.edu/epb/in...pdf/lec1&2.pdf

HTH

FurPaw




--
Brain cells come and brain cells go, but fat cells live forever.

To reply, unleash the dog.

  #3  
Old February 3rd 04, 05:27 PM
FurPaw
external usenet poster
 
Posts: n/a
Default

Alison wrote:
Hi,
I have to review some data and and I don't understand the term "
back-transformed means " I know it's something to do with averages
but can any one explain it in simple terms (the simpler the beterG)
and how accurate is it?
TIA Alison


Here's a slide show that gives a brief definition. When the simple
arithmetic mean isn't a good representation of the data, sometimes the data
are transformed (e.g., by taking log10 of each data point), then averaging
the transformed values. The resulting mean is still expressed as a log
value, so it is back-transformed (10 raised to the log value) to give a
geometric mean of the original data set - which normally would be different
than the arithmetic mean.

http://www.plantbio.ohiou.edu/epb/in...pdf/lec1&2.pdf

HTH

FurPaw




--
Brain cells come and brain cells go, but fat cells live forever.

To reply, unleash the dog.

  #4  
Old February 3rd 04, 05:27 PM
FurPaw
external usenet poster
 
Posts: n/a
Default

Alison wrote:
Hi,
I have to review some data and and I don't understand the term "
back-transformed means " I know it's something to do with averages
but can any one explain it in simple terms (the simpler the beterG)
and how accurate is it?
TIA Alison


Here's a slide show that gives a brief definition. When the simple
arithmetic mean isn't a good representation of the data, sometimes the data
are transformed (e.g., by taking log10 of each data point), then averaging
the transformed values. The resulting mean is still expressed as a log
value, so it is back-transformed (10 raised to the log value) to give a
geometric mean of the original data set - which normally would be different
than the arithmetic mean.

http://www.plantbio.ohiou.edu/epb/in...pdf/lec1&2.pdf

HTH

FurPaw




--
Brain cells come and brain cells go, but fat cells live forever.

To reply, unleash the dog.

  #5  
Old February 3rd 04, 05:27 PM
FurPaw
external usenet poster
 
Posts: n/a
Default

Alison wrote:
Hi,
I have to review some data and and I don't understand the term "
back-transformed means " I know it's something to do with averages
but can any one explain it in simple terms (the simpler the beterG)
and how accurate is it?
TIA Alison


Here's a slide show that gives a brief definition. When the simple
arithmetic mean isn't a good representation of the data, sometimes the data
are transformed (e.g., by taking log10 of each data point), then averaging
the transformed values. The resulting mean is still expressed as a log
value, so it is back-transformed (10 raised to the log value) to give a
geometric mean of the original data set - which normally would be different
than the arithmetic mean.

http://www.plantbio.ohiou.edu/epb/in...pdf/lec1&2.pdf

HTH

FurPaw




--
Brain cells come and brain cells go, but fat cells live forever.

To reply, unleash the dog.

  #6  
Old February 4th 04, 12:32 AM
Alison
external usenet poster
 
Posts: n/a
Default


"FurPaw" wrote in message
...
Here's a slide show that gives a brief definition. When the

simple
arithmetic mean isn't a good representation of the data, sometimes

the data
are transformed (e.g., by taking log10 of each data point), then

averaging
the transformed values. The resulting mean is still expressed as a

log
value, so it is back-transformed (10 raised to the log value) to

give a
geometric mean of the original data set - which normally would be

different
than the arithmetic mean.


http://www.plantbio.ohiou.edu/epb/in...ures/pdf/lec1&
2.pdf

HTH

FurPaw

Thanks Furpaw,
That helps . I took out a maths school book from the library today
and I didn't realise there was so much I'd forgotten. Maths wasn't my
strong point at school but at least we didn't use calculators in
exams like kids do now.
Alison


  #7  
Old February 4th 04, 12:32 AM
Alison
external usenet poster
 
Posts: n/a
Default


"FurPaw" wrote in message
...
Here's a slide show that gives a brief definition. When the

simple
arithmetic mean isn't a good representation of the data, sometimes

the data
are transformed (e.g., by taking log10 of each data point), then

averaging
the transformed values. The resulting mean is still expressed as a

log
value, so it is back-transformed (10 raised to the log value) to

give a
geometric mean of the original data set - which normally would be

different
than the arithmetic mean.


http://www.plantbio.ohiou.edu/epb/in...ures/pdf/lec1&
2.pdf

HTH

FurPaw

Thanks Furpaw,
That helps . I took out a maths school book from the library today
and I didn't realise there was so much I'd forgotten. Maths wasn't my
strong point at school but at least we didn't use calculators in
exams like kids do now.
Alison


  #8  
Old February 4th 04, 12:32 AM
Alison
external usenet poster
 
Posts: n/a
Default


"FurPaw" wrote in message
...
Here's a slide show that gives a brief definition. When the

simple
arithmetic mean isn't a good representation of the data, sometimes

the data
are transformed (e.g., by taking log10 of each data point), then

averaging
the transformed values. The resulting mean is still expressed as a

log
value, so it is back-transformed (10 raised to the log value) to

give a
geometric mean of the original data set - which normally would be

different
than the arithmetic mean.


http://www.plantbio.ohiou.edu/epb/in...ures/pdf/lec1&
2.pdf

HTH

FurPaw

Thanks Furpaw,
That helps . I took out a maths school book from the library today
and I didn't realise there was so much I'd forgotten. Maths wasn't my
strong point at school but at least we didn't use calculators in
exams like kids do now.
Alison


  #9  
Old February 4th 04, 12:32 AM
Alison
external usenet poster
 
Posts: n/a
Default


"FurPaw" wrote in message
...
Here's a slide show that gives a brief definition. When the

simple
arithmetic mean isn't a good representation of the data, sometimes

the data
are transformed (e.g., by taking log10 of each data point), then

averaging
the transformed values. The resulting mean is still expressed as a

log
value, so it is back-transformed (10 raised to the log value) to

give a
geometric mean of the original data set - which normally would be

different
than the arithmetic mean.


http://www.plantbio.ohiou.edu/epb/in...ures/pdf/lec1&
2.pdf

HTH

FurPaw

Thanks Furpaw,
That helps . I took out a maths school book from the library today
and I didn't realise there was so much I'd forgotten. Maths wasn't my
strong point at school but at least we didn't use calculators in
exams like kids do now.
Alison


 




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