Week2 Markdown Solution

R Markdown

This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see http://rmarkdown.rstudio.com.

When you click the Knit button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:

summary(cars)

##      speed           dist       
##  Min.   : 4.0   Min.   :  2.00  
##  1st Qu.:12.0   1st Qu.: 26.00  
##  Median :15.0   Median : 36.00  
##  Mean   :15.4   Mean   : 42.98  
##  3rd Qu.:19.0   3rd Qu.: 56.00  
##  Max.   :25.0   Max.   :120.00

Including Plots

You can also embed plots, for example:

Note that the echo = FALSE parameter was added to the code chunk to prevent printing of the R code that generated the plot. #Week2 Assignment Solution library(tidyverse) getwd() # set working directory setwd (“D:/1DSRJeffereyNiemanGH/RJefferyNiemanWeek2”) getwd()

Use the summary function to gain an overview of the data set. Then display the mean and median for at least two attributes

mydata = read_csv (“datasets.csv”)

summary(mydata) str(mydata) mydata D <- mydata

str(D)

D %>% summarise((mean(Rows))) D %>% summarise ((mean(Cols))) D %>% summarise ((median(Rows))) D %>% summarise ((median(Cols)))

2. Create a new data frame with a subset of the columns and rows. Make sure to rename it.

3. Create new column names for the new data frame.

dfgh <- data.frame(D) dfgh

dfNew <- dfgh %>% select (RowsNew = Rows, ColsNew = Cols,Package) dfNew

dfNew2 <- dfNew %>% filter (RowsNew >= 1600)

head(dfNew2)

summary (dfNew2) str(dfNew2)

dfNew2

4. Use the summary function to create an overview of your new data frame. The print the mean and median for the same two attributes. Please compare.

dfNew2 %>% summarise(mean(RowsNew)) dfNew2 %>% summarise((mean(ColsNew))) dfNew2 %>% summarise((median(RowsNew))) dfNew2 %>% summarise((median(ColsNew)))

5.to change the value of DAAG in the package into DAAGpack

For at least 3 values in a column please rename so that every value in that column is renamed.

dfNew2$ Package [dfNew2$Package== ‘DAAG’] <-‘DAAGPack’ dfNew2$ Package [dfNew2$Package== ‘boot’] <-‘bootPack’ dfNew2$ Package [dfNew2$Package== ‘Ecdat’] <-‘EcdatPack’ rbind (head(dfNew2), tail(dfNew2)) dfNew2