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import pandas as pd
import xlrd as xd

def xls2csv(f, index=False, header=True):
	wb = xd.open_workbook(f)
	snames=[]
	for s in wb.sheets():
		snames.append(s.name)
	for s in snames:
		x = pd.read_excel(f,s)

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# This file contains two functions:
# 	- combine.samples (used by par.trace.samples)
# 	- par.trace.samples
# and an example at the bottom.

## Author: Mikhail Popov (mikhail [at] mpopov.com)

# install.packages("rjags") # JAGS must be installed on system
# install.packages("doMC") # Unix only

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setwd('~/Downloads')
dat <- read.csv('VennDiagrams2-data.csv', stringsAsFactors=F)
for(u in c('visited','joined')){
  dat[[u]] <- as.Date(dat[[u]])
}

library(plyr)
library(reshape2)
library(chron)
dat$monthly = paste(months(as.chron(dat$visited)), years(as.chron(dat$visited)))

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{
 "metadata": {
  "name": "Survival Example"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {

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