You've changed the prior!

Fundamentals of Bayesian Data Analysis in R

Rasmus Bååth

Data Scientist

Next up on reasons to use Bayesian data analysis

You can include information sources in addition to the data.
You can make any comparisons between groups or datasets.
You can use the result of a Bayesian analysis to do Decision Analysis.
You can change the underlying statistical model.

Comparing Video and Text ads

posterior

   video_prop text_prop
1        0.08      0.10
2        0.10      0.07
3        0.16      0.05
4        0.09      0.05
5        0.18      0.03
6        0.13      0.05
7        0.12      0.10
8        0.10      0.04
9        0.11      0.09
10       0.18      0.05
11       0.12      0.04
12       0.13      0.07
13       0.10      0.13
14       0.15      0.03
15       0.07      0.05
16       0.14      0.09
...      ...       ...

Comparing Video and Text ads

posterior$prop_diff <- posterior$video_prop - posterior$text_prop
posterior

   video_prop text_prop prop_diff
1        0.08      0.10     -0.02
2        0.10      0.07      0.03
3        0.16      0.05      0.11
4        0.09      0.05      0.04
5        0.18      0.03      0.15
6        0.13      0.05      0.08
7        0.12      0.10      0.02
8        0.10      0.04      0.06
9        0.11      0.09      0.02
10       0.18      0.05      0.13
11       0.12      0.04      0.08
12       0.13      0.07      0.06
13       0.10      0.13     -0.03
14       0.15      0.03      0.11
15       0.07      0.05      0.01
...      ...       ...       ...

How does the prop_diff() distribution look?

Fundamentals of Bayesian Data Analysis in R