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340 bytes added ,  06:43, 17 December 2020
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We could use the serving size field for this: if it contains ml, it might be taken from a per serving nutritional table. I have seen exceptions however. Unfortuately the web-interface does not allow me to search on that.
 
We could use the serving size field for this: if it contains ml, it might be taken from a per serving nutritional table. I have seen exceptions however. Unfortuately the web-interface does not allow me to search on that.
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A better proxy is the existence of the transfat field. If there is data in that field, it is most likely a US or Canadian style nutritional table. Again this not a guarantee as other countries mark transfat as well. This results in 724 products. However some 60 products of this transfat sample have fat percentages around 100%, so we have false positives.
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A better proxy is the existence of the transfat field. If there is data in that field, it is most likely a US or Canadian style nutritional table. Again this not a guarantee as other countries mark transfat as well. This results in 724 products. However some 60 products of this transfat sample have fat percentages around 100%, so we have false positives. We can add a fat limit of 94%, resulting in 629 products.
    
The US/Canadian style nutritional tables do not show the energy in kJoule. Thus if there is a value in that field, it is not US/Canadian. This results in 746 products. This is a low number, inducating that the field has not been filled in very well.
 
The US/Canadian style nutritional tables do not show the energy in kJoule. Thus if there is a value in that field, it is not US/Canadian. This results in 746 products. This is a low number, inducating that the field has not been filled in very well.
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==== Per 100 ml ====
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Defining this group of products is more difficult. We have only the fat percentage itself as indication. As the fat percentage can not be larger than 100%, we can use the specific gravity (91.1%) as limit. This assumes all oils have the same specific gravity.
    
=== Normalisation ===
 
=== Normalisation ===
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