Issue 22: huge values are valid JSON

analyses/2019_03_aliamcami_greatest_values_are_json/README.md

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+# Overview
+
+All the greatest values are JSON, but they represent very little percentage of the whole data. 
+
+### Most of the data have small value_len 
+    (mean = 1356 for the 10% sample)
+- 95,58% of the data have value_len smaller than the mean 
+- 4,42% are bigger than the mean
+- 9.35% are valid JSON
+
+### Values above the mean: 
+- 61,54% are NOT valid JSON
+- 38,46% are valid JSON
+
+### Values that are 1 standard deviation (std) above the mean 
+    (std = 26310 for 10% sample):
+- 0,11% are NOT valid JSON
+- 99,88% are valid JSON
+- The bigger the value the greater the chance of being a valid JSON
+
+### Values 4 std above the mean 
+- 100% are valid JSON
+- The biggest non-JSON value have the length of 104653
+
+##
+The top 46745 gratest value_len are valid JSONs, that is 9.35% of the filtered sample (value_len > mean) and 0,41% of the original 10% sample.