Daily weigh-ins can be very consistent if you weigh yourself in the morning at about the same time after using the toilet, and before eating/drinking anything.
That's why I want a smoothing algorithm, but the one I found here[1] is giving me a bit of a problem (I can't see why the data points are being squeezed).
[1] http://www.swharden.com/blog/2008-11-17-linear-data-smoothin...
How much water do you drink per day? I have found that in times where I'm not drinking enough water, my weight will fluctuate more.
I think the noise has more to do about the time you last drank water (right before bed, for example), also the time you last ate (the later you eat, the more food you'll still be digesting when weighing yourself). It's not a problem by any stretch, it's just normal data variance.