Ask Ghassem - Recent questions tagged normal-distribution

Using aggregate data to generate observation-level data statistically sound?

Tue, 11 Jun 2019 22:04:01 +0000

Context: In the realm of Paid Search Marketing. Current reporting does not provide event level data only aggregate totals with different segments. Want to compare distributions/test statistical significance of A/B test results. Did not want to assume that data followed normal distribution or know STDEV for data so came with this approach.

My Question: I am going to use the average "CPA" or "CTR" for a date range, and generate an observation for each conversion based off the average for a time range. Is this statistically sound way if I want to generate raw data? Would I have wonky distributions because of the multiple averages? Just want a gutcheck if I'm completely off base.

My Aggregate data looks like below:

Day	Cost	Acquisition	CPA or CTR
1	40	2	$20
2	75	3	$25

Observation data I generate looks like below:

Day	Acquisition
1	$20
1	$20
2	$25
2	$25
2	$25

I really appreciate your help with this question! An important project to me at work.

Computing the Confidence Interval for a Difference Between Two Means

Fri, 07 Dec 2018 23:02:45 +0000

What is degree of Freedom while calculating confidence interval?

Fri, 07 Dec 2018 22:27:27 +0000

What is the T Distribution?

Fri, 30 Nov 2018 21:22:02 +0000

Probability for the data items within mean +- 1, +-2, +-3 standard deviation?

Fri, 30 Nov 2018 21:15:35 +0000

What will be probability for the data items within mean +- 1, +-2, +-3 standard deviation?

Wed, 14 Nov 2018 15:10:15 +0000

How much percentage of data items are consumed within mean +-1 , +-2, +-3 standard deviation?

Wed, 14 Nov 2018 15:04:52 +0000

What is the mean and standard deviation of a standard normal distribution?

Fri, 12 Oct 2018 01:39:12 +0000

How to calculate normal distribution?

Sat, 01 Sep 2018 20:20:01 +0000