如何搭建指標(biāo)體系？ 近期遇到很多客戶指標(biāo)缺乏體系，經(jīng)常收到來自業(yè)務(wù)碎片化的需求，想搭建一個相對完善的指標(biāo)體系和分析體系，故借此機對搭建指標(biāo)體系的Framework做個粗...
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如何搭建指標(biāo)體系？ -
2019-01-27 周記
2019.1.21-2019.1.27 這周總體上來說是平淡的一周，積極地層面有些，如帶父母吃了新式的餐廳，和許久不見的朋友一起聊天唱k；相對頹廢一些的就是父母回家后和室友瘋...
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2019-1-20 周記
2019.1.14-2019.1.20 受今天看的Kris的文章的啟發(fā)，準(zhǔn)備開始寫周記，復(fù)盤一周做了什么：有哪些做的好的地方（受Prof. Tal啟發(fā)），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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無標(biāo)題文章
In SQL, the ORDER BY keyword is used to sort results in ascending or descending order a...
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Aggregate functions
Often, you will want to perform some calculation on the data in a database. SQL provide...