Weekly Analysis:
Updated at 19th Nov. 2018:

Overview plot and trend

General trend has been downward, despite of one spike due to adjustment on rank requirements aims at Junior Member rank.

Mean +/- standard deviation; Median (Interquartile range)

1) The first period, with 4 weeks from 24th Jan. to 18th Feb. 2018 [the first week in these fours is incomplete one).
The mean of weekly merit is 18983 with standard deviation is 8739.
Minimum and maximum of the period are 11722 and 30949, respectively.
2) The second period, since 19th Feb. 2018, with 38 weeks in total.
The median of the 38-week period is 4423, with 50% of those weeks have total weekly merits in the range from 3854 to 5487 (the interquartile range). 25% of those weeks have total weekly merit above 5487 and 25% of them have total weekly merits below 3854.
Minimum and maximum of the period are 3065 and 8806.

Potential Outliers
Interquartile Range (Q1 - Q3), with Q1 = 3854, Q3 = 5487.
--> IQR = Q3- Q1 = 5487 - 3854 = 1633.
---> 1.5*IQR = 1633*1.5 = 2450.
Therefore, extremely potential outliers are weeks with total distributed merits above 7937 or below 1404.

Formula to calculate potential outliers:
- Q3 + 1.5* IQR = 5487 +2450 = 7937;
- Q1 - 1.5*IQR = 3854 - 2450 = 1404.
Now, lets see how many extremely potential outliers we have. Only two.

Code:

+----------------+
   | week merit |
   |----------------|
  1. | 2018w8 8758 |
  2. | 2018w9 8806 |
   +----------------+

They are from those days:

Code:

. list if id >26 & id < 41

   +----------------------------------------------------------------+
   | id day month2 year merit date week month |
   |----------------------------------------------------------------|
27. | 27 19 2 2018 1403 19feb2018 2018w8 2018m2 |
28. | 28 20 2 2018 1169 20feb2018 2018w8 2018m2 |
29. | 29 21 2 2018 1266 21feb2018 2018w8 2018m2 |
30. | 30 22 2 2018 1279 22feb2018 2018w8 2018m2 |
31. | 31 23 2 2018 1046 23feb2018 2018w8 2018m2 |
   |----------------------------------------------------------------|
32. | 32 24 2 2018 1409 24feb2018 2018w8 2018m2 |
33. | 33 25 2 2018 1186 25feb2018 2018w8 2018m2 |
34. | 34 26 2 2018 1382 26feb2018 2018w9 2018m2 |
35. | 35 27 2 2018 1326 27feb2018 2018w9 2018m2 |
36. | 36 28 2 2018 991 28feb2018 2018w9 2018m2 |
   |----------------------------------------------------------------|
37. | 37 1 3 2018 1333 01mar2018 2018w9 2018m3 |
38. | 38 2 3 2018 1696 02mar2018 2018w9 2018m3 |
39. | 39 3 3 2018 1089 03mar2018 2018w9 2018m3 |
40. | 40 4 3 2018 989 04mar2018 2018w9 2018m3 |
   +----------------------------------------------------------------+

The most interesting thing is even when new rank requirements implemented on Junior Member rank, impacts of the one did not last for too long, and ranged from the end day of week 2018w37 to the first 3 days of week #2018w38.
Consequently, both of weeks #2018w37 and #2018w38 are not extremely potential outliers.

Code:

. list if id > 234 & id < 241

   +------------------------------------------------------------------+
   | id day month2 year merit date week month |
   |------------------------------------------------------------------|
235. | 235 15 9 2018 463 15sep2018 2018w37 2018m9 |
236. | 236 16 9 2018 2463 16sep2018 2018w37 2018m9 |
237. | 237 17 9 2018 1862 17sep2018 2018w38 2018m9 |
238. | 238 18 9 2018 1294 18sep2018 2018w38 2018m9 |
239. | 239 19 9 2018 1268 19sep2018 2018w38 2018m9 |
   |------------------------------------------------------------------|
240. | 240 20 9 2018 846 20sep2018 2018w38 2018m9 |
   +------------------------------------------------------------------+

Anyway, those two weeks are still potential outliers because they are higher than the 74th quartile (Q3, at 5487).

Code:

. list

   +-----------------+
   | week merit |
   |-----------------|
  1. | 2018w4 30949 |
  2. | 2018w5 19958 |
  3. | 2018w6 13304 |
  4. | 2018w7 11722 |
  5. | 2018w8 8758 |
   |-----------------|
  6. | 2018w9 8806 |
  7. | 2018w10 7253 |
  8. | 2018w11 7309 |
  9. | 2018w12 6941 |
10. | 2018w13 6707 |
   |-----------------|
11. | 2018w14 6415 |
12. | 2018w15 5487 |
13. | 2018w16 4631 |
14. | 2018w17 4585 |
15. | 2018w18 4953 |
   |-----------------|
16. | 2018w19 4753 |
17. | 2018w20 4346 |
18. | 2018w21 3854 |
19. | 2018w22 4183 |
20. | 2018w23 4527 |
   |-----------------|
21. | 2018w24 3818 |
22. | 2018w25 4921 |
23. | 2018w26 4457 |
24. | 2018w27 4253 |
25. | 2018w28 4239 |
   |-----------------|
26. | 2018w29 4159 |
27. | 2018w30 3652 |
28. | 2018w31 3798 |
29. | 2018w32 3994 |
30. | 2018w33 3618 |
   |-----------------|
31. | 2018w34 3789 |
32. | 2018w35 3065 |
33. | 2018w36 3574 |
34. | 2018w37 5630 |
35. | 2018w38 7825 |
   |-----------------|
36. | 2018w39 4388 |
37. | 2018w40 4271 |
38. | 2018w41 3800 |
39. | 2018w42 4821 |
40. | 2018w43 3945 |
   |-----------------|
41. | 2018w44 3339 |
42. | 2018w45 4513 |
43. | 2018w46 1740 |
   +-----------------+