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Statistics & SQL
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평균, 분산, 표준편차를 R로 직접 구현하는 법.

예시 데이터 : https://www.kaggle.com/uciml/red-wine-quality-cortez-et-al-20091\. 평균이란? 각 관측치들을 모두 더한 값을 관측치들의 전체 수로 나눈 것을 의미합니다.R에서는 mean() 함수로 간단하게 연

2021년 9월 8일
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커널 밀도 곡선 그리기 with ggplot2

예시 데이터 : https://www.kaggle.com/uciml/red-wine-quality-cortez-et-al-2009커널 밀도 곡선은 히스토그램과 다르게 커널 밀도 추정 함수를 통해 전체 면적의 합이 1로 표현되며, 부드러운 곡선으로 나타내기 때문

2021년 9월 8일
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Type of Triangle (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/what-type-of-triangle/problemType of Triangle (Easy)TRIANGLES 테이블에서 조회한다.조건 1. A,

2021년 9월 2일
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Employee Salaries (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/salary-of-employees/problemEmployee Salaries (Easy)EMPLOYEE 테이블에서 직원 이름(name)을 조회한

2021년 9월 2일
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Employee Names (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/name-of-employees/problemEmployee Names (Easy)EMPLOYEE 테이블에서 직원 이름(name)을 조회한다.조건

2021년 9월 2일
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Higher Than 75 Marks (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/more-than-75-marks/problemHigher Than 75 Marks (Easy)STUDENTS 테이블에서 점수가 75점을 넘는 학생

2021년 9월 2일
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ggplot2에서 forcats 패키지의 활용에 대하여

예시 데이터 : https://www.kaggle.com/sakshigoyal7/credit-card-customersforcats 패키지는 범주형 변수의 level 순서를 상황에 따라 알맞게 조절하는 기능을 제공합니다. (tidyverse 패키지에 속해 있습

2021년 9월 1일
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Weather Observation Station 17 (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/weather-observation-station-17/problemWeather Observation Station 17 (Easy)STATION

2021년 9월 1일
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Weather Observation Station 16 (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/weather-observation-station-16/problemWeather Observation Station 16 (Easy)STATION

2021년 9월 1일
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Weather Observation Station 15 (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/weather-observation-station-15/problemWeather Observation Station 15 (Easy)STATION

2021년 9월 1일
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Weather Observation Station 14 (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/weather-observation-station-14/problemWeather Observation Station 14 (Easy)STATION

2021년 9월 1일
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Weather Observation Station 13 (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/weather-observation-station-13/problemWeather Observation Station 13 (Easy)STATION

2021년 8월 31일
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Weather Observation Station 12 (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/weather-observation-station-12/problemWeather Observation Station 12 (Easy)STATION

2021년 8월 31일
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Weather Observation Station 11 (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/weather-observation-station-11/problemWeather Observation Station 11 (Easy)STATION

2021년 8월 31일
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Weather Observation Station 10 (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/weather-observation-station-10/problemWeather Observation Station 10 (Easy)STATION

2021년 8월 31일
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Weather Observation Station 9 (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/weather-observation-station-9/problemWeather Observation Station 9 (Easy)STATION 테

2021년 8월 31일
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Weather Observation Station 8 (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/weather-observation-station-8/problemWeather Observation Station 8 (Easy)STATION 테

2021년 8월 30일
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Weather Observation Station 7 (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/weather-observation-station-7/problemWeather Observation Station 7 (Easy)STATION 테

2021년 8월 30일
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Weather Observation Station 6 (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/weather-observation-station-6/problemWeather Observation Station 6 (Easy)STATION 테

2021년 8월 30일
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Weather Observation Station 5 (Easy)

HackerRank SQL Problem : https://www.hackerrank.com/challenges/weather-observation-station-5/problemWeather Observation Station 5 (Easy)STATION 테

2021년 8월 30일
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