如何搭建指标体系？ 近期遇到很多客户指标缺乏体系，经常收到来自业务碎片化的需求，想搭建一个相对完善的指标体系和分析体系，故借此机对搭建指标体系的Framework做个粗...
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2019-01-27 周记
2019.1.21-2019.1.27 这周总体上来说是平淡的一周，积极地层面有些，如带父母吃了新式的餐厅，和许久不见的朋友一起聊天唱k；相对颓废一些的就是父母回家后和室友疯...
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2019-1-20 周记
2019.1.14-2019.1.20 受今天看的Kris的文章的启发，准备开始写周记，复盘一周做了什么：有哪些做的好的地方（受Prof. Tal启发），有哪些不足，有哪些可...
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Python Basic
# Import the math package import math as math # Calculate C C = 2*math.pi*r # Calculate...
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Robust functions
# Define troublesome x and y x <- c(NA, NA, NA) y <- c( 1, NA, NA, NA) both_na <- funct...
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Advanced inputs and outputs
# Define safe_readLines() safe_readLines <- safely(readLines) # Use the safe_readLines(...
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When to write a function
# Define example vector x x <- 1:10 # Define rng rng <- range(x, na.rm = TRUE) # Rewrit...
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A quick refresher
# Define ratio() function ratio <- function(x, y) { x/y } # Cal ratio() with arguments ...
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Importing data from statistical software haven
haven is an extremely easy-to-use package to import data from three software packages: ...
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Data on the web part2
In the simplest setting,fromJSON()can convert character strings that represent JSON dat...
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Choose max and min row
# Finish the read.delim() call hotdogs <- read.delim("hotdogs.txt", header = F, col.nam...
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Strings as factors
For all importing functions in theutilspackage, this argument isTRUE, which means that ...
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Data on the web
# Load the readr package library(readr) # Import the csv file: pools url_csv <- "http:/...
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Importing data from database
The first step to import data from a SQL database is creating a connection to it. As Fi...
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SQL Queries from inside R
In your life as a data scientist, you'll often be working with huge databases that cont...
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Aggregate functions
Often, you will want to perform some calculation on the data in a database. SQL provide...