I currently have ads in the top 1-4 spots depending on keywords. If I pause Adwords while on vacation will I lose any Adwords ranking or postioning when I return & restart?
No position is based on normalized CTR, Quality score and bid price. Pausing your campaigns will not loose any historical CTR data. However your market landscape may change in the time you are away (it's possible).
Just a thought in passing, but I've been wondering recently how Google uses the CTR. Clearly, it can't just look at your CTR from yesterday, as your QS would be all over the place. Also, it can't look at your lifetime CTR, since after 6 months, it'd be virtually impossible to improve it... Any thoughts on this? Is it some kind of weighted (or unweighted) average over the last week, or month, or something? If so, then pausing the campaign could have a positive or negative impact on the averaged CTR, and hence the QS...
Good question CM. Actually, I think it is a weighted average compared to other advertisers over a certain time. Also, there is a similar thread on this here: http://www.webmasterworld.com/google_adwords/3193035.htm
I did something similar for a company some time ago with their sales figures to work out a 'popularity' ranking for their products. Their sales fluctuated quite dramatically because of the nature of their business so I ended up using a combination of factors. Firstly, I discarded very recent data (within a week of reporting) as these figures were not confirmed (returned goods, failed payments, etc.). I then split the figures into weekly periods and looked at the sales for each week. For each week I applied a weighting factor so that 100 sales from 30 weeks before the date of reporting were less 'important' than 100 sales from just 3 weeks previously. On top of this there were a couple of seasonal and product related 'fudge factors'. I've always imagined that Adwords operates along similar lines, albeit more complicated and probably more efficient than my version Jon http://www.cobnut.net/
I've worked under the assumption that it was a fairly basic weighted average - something along the lines of: 40% of your CTR over the last 7 days + 30% of your CTR over the previous 7 days + 20% of your CTR over the 7 days before that + 10% of your CTR over the 7 days prior to that. Or something...