phblj
/ coinflips.py
Last active
January 2, 2016 20:59
Early test termination This is a simple script to illustrate the danger of early termination of a trial (a form of selection bias). The script takes a fair coin, and flips it *flips* times. Throughout the test, it watches to see if the current counts are ever "statistically significant (p <0.05)" to be more likely heads than tails. This is to em…
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| import math | |
| import random | |
| pdf_memo = {} | |
| def pdf(h, n): | |
| h = min(h, n-h) | |
| if (h, n) not in pdf_memo: | |
| pdf_memo[(h, n)] = math.factorial(n)/(math.factorial(h)*math.factorial(n-h))*(0.5**h)*(0.5**(n-h)) |
phblj
/ schedulers.py
Last active
July 11, 2023 13:00
SingleRunScheduler to remove SPOF of lone celerybeat server. Sorry it's a bit disjoint-- this is pulled out from our codebase, which has a pretty big chunk of custom orm in it
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| def get_last_run(task_name): | |
| task = db.scheduled_tasks.find_one({'name': task_name}) | |
| if task is None: | |
| last_run = time.time() | |
| # race condition possible, but this only happens at first run | |
| db.scheduled_tasks.update( | |
| { | |
| 'name': task_name | |
| }, |