Hi Chris,

1. 1 and -1 are the same at campaign level - both effectively means that 
you want to target desktop and mobile with same bid. -1 makes more sense at 
adgroup level, where setting 1 means you want both mobile and desktop bids 
to be same, whereas -1 means you are resetting the adgroup level bid and 
want to use the campaign level bid instead.

Cheers,
Anash

On Monday, May 13, 2013 3:53:40 PM UTC-7, Chris Lande wrote:
>
> To clarify, if you clear the bidModifier on an adGroup then the adGroup 
> would use the bidModifier defined on the campaign. Is that correct?
>
> Thanks,
> Chris
>
> On Thursday, May 9, 2013 10:33:05 AM UTC-7, Chris Lande wrote:
>>
>> Hi Anash,
>>
>> Thanks for the response. What's still unclear is, is there any difference 
>> between a value of 1 and -1? That is, with either value the mobile ads 
>> would be bid the same as the desktop ads, right?
>>
>> Thanks,
>> Chris
>>
>> BTW, I did a quick test and the bidModifier actually has 3 significant 
>> digits (two decimal places), which makes sense, otherwise you wouldn't be 
>> able to represent something like 123%.
>>
>> On Thursday, May 9, 2013 8:12:26 AM UTC-7, Anash P. Oommen (AdWords API 
>> Team) wrote:
>>>
>>> Hi Oliver,
>>>
>>> -1 is for resetting mobile bid modifier (i.e. -- on UI), mobile bid 
>>> modifier values are from 0 to 4 in steps of 0.1 (-100% to +300% on UI).
>>>
>>> Cheers,
>>> Anash P. Oommen,
>>> AdWords API Advisor.
>>>
>>> On Thursday, May 9, 2013 6:48:28 PM UTC+5:30, Oliver wrote:
>>>>
>>>> I'm not sure which bid modifier you're referring to, but if it is 
>>>> mobile bid modifier then the API values are 0 to 4 and not -1 to 3.  This 
>>>> is what the documentation says and what our current code uses (and it 
>>>> works).
>>>>
>>>>
>>>>
>>>> On Thursday, May 9, 2013 1:53:53 PM UTC+1, mm wrote:
>>>>>
>>>>> I believe valid values are from -1 through 3 in .1 increments. So as 
>>>>> examples: -1 is effectively -100%, or don't bid on mobile at all; -.2 
>>>>> would 
>>>>> be bid 80% of the base bid; 0 = just use the bid; .5 bid at 150%.
>>>>>
>>>>> HTH -
>>>>> mm
>>>>>
>>>>> On Thursday, May 9, 2013 2:22:43 AM UTC-5, Oliver wrote:
>>>>>>
>>>>>> I'm surprised you didn't get an error when setting a bid modifier to 
>>>>>> -1.  I thought the values have to be 0+.
>>>>>>
>>>>>> But, anyway, if you go by what the UI show you, a value of "--" means 
>>>>>> your Ads will not run at all (i.e. you don't have a bid), whereas a 
>>>>>> value 
>>>>>> of 0% means your Ads will run using exactly the same parent bid.
>>>>>>
>>>>>> Oliver
>>>>>>
>>>>>>
>>>>>> On Thursday, May 9, 2013 1:13:18 AM UTC+1, Chris Lande wrote:
>>>>>>
>>>>>>> if you set the bidModifier to -1 in the API then the UI shows it as 
>>>>>>> "--". But if you set it to 1 in the API the UI shows it as "0% 
>>>>>>> increase". 
>>>>>>> Isn't this effectively the same thing?
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Chris
>>>>>>>
>>>>>>

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