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assignment 2 #244

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assignment 2 #244

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17 changes: 16 additions & 1 deletion Assignment 2-2020.Rmd
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@ library(dplyr)

D1 <- read.csv("video-data.csv", header = TRUE)


#Create a data frame that only contains the years 2018
D2 <- filter(D1, year == 2018)
```
Expand All @@ -37,6 +38,7 @@ D2 <- filter(D1, year == 2018)

hist(D2$watch.time)


#Change the number of breaks to 100, do you get the same impression?

hist(D2$watch.time, breaks = 100)
Expand Down Expand Up @@ -92,17 +94,30 @@ pairs(D5)

```{r}
#rnorm(100, 75, 15) creates a random sample with a mean of 75 and standard deviation of 20
score <- rnorm(100, 75, 15)
S1 <- data.frame(score)
#filter() can be used to set a maximum and minimum value
S1 <- filter(S1, score<=100)

#round() rounds numbers to whole number values
#sample() draws a random samples from the groups vector according to a uniform distribution

S2 <- data.frame(rep(100,3))
names(S2) <- "score"
S3 <- bind_rows(S1, S2)
S3$score <- round(S3$score, 0)

interest <- c("sport", "music", "nature", "literature")
S3$interest <- sample(interest, 100, replace = TRUE)
S3$stid <- seq(1, 100, 1)


```

2. Using base R commands, draw a histogram of the scores. Change the breaks in your histogram until you think they best represent your data.

```{r}

hist(score)
```


Expand Down
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