Eric,
thanks for your explanation, that does make sense!
1 question:
> However, if you include a NgramGroupsSearchParameter with the ngram
> group "car rental" the results are limited to variations of that
> keyword:

That is only possible after getting back first batch of keywords with
there Ngram name.
Then do a second call to get only the ngram group "car rental" out of
it?

Will the first batch contain all kewyord variations for "car rental"?
Or is the second call with the NgramGroupsSearchParameter with the
ngram
group "car rental" a more complete list or yust a sublist of teh first
call?

On Nov 10, 5:25 pm, AdWords API Advisor <[email protected]>
wrote:
> Hi,
>
> I've talked with the engineers that developed this parameter and they
> have given me the following description:
>
>   A keyword is assigned to the ngram group with the longest matching
> substring.  Ngram groups are defined as substrings that that appear
> more than n times in the result set (where n is defined by the AdWords
> system).
>
> An ngram group is like a stem keyword.  It is a substring of the
> keyword that is common to many other keywords. Here are some examples
>
>   [keyword] => [ngram group]
>   car => car
>   car leasing => car
>   car rental => car rental
>   car rental coupons => car rental
>
> The substring "car leasing" is not common enough to have its own ngram
> group, so it goes in the "car" group.  However "car rental" is a very
> common substring, so it has its own ngram group, which includes "car
> rental coupons".  You can find out the ngram group of a keyword idea
> by including the requestedAttributeType NGRAM_GROUP.
>
> This parameter can be useful when you want to get keyword ideas that
> are variations on an existing keyword.  If you don't use an
> NgramGroupsSearchParameter the following keyword ideas are returned
> for the seed keyword "car rental":
>
>   car rentals
>   rental car
>   car hire
>   cheap hire car
>   airport
>
> However, if you include a NgramGroupsSearchParameter with the ngram
> group "car rental" the results are limited to variations of that
> keyword:
>
>   car rental cheap
>   luxury car rental
>   airport car rental
>   cheapest car rental
>
> Let me know if you have any other questions.
>
> Best,
> - Eric
>
> On Nov 9, 3:13 pm, keesjan <[email protected]> wrote:
>
> > Ok thanks in forworth,
> > this gives me a kind of feeling the the documentation can do better,
> > isn't?
>
> > On Nov 9, 6:19 pm, AdWords API Advisor <[email protected]>
> > wrote:
>
> > > Hi,
>
> > > I will have to follow up with the core engineering team to get more
> > > information.
>
> > > Best,
> > > - Eric Koleda, AdWords API Team
>
> > > On Nov 9, 7:36 am, keesjan <[email protected]> wrote:
>
> > > > Wat means: NgramsGroups. is that the category group a keyword belongs
> > > > too?
>
> > > >http://code.google.com/apis/adwords/v2009/docs/reference/TargetingIde...

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