finish following instructors_Xiangyu(Edward) Wang

.gitignore

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+.Rproj.user
+.Rhistory
+.RData
+.Ruserdata

Class 7 Instructions.Rmd

@@ -11,14 +11,14 @@ date: "February 13, 2016"
 We will use two packages: tidyr and dplyr
 ```{r}
 #Insall packages
-install.packages("tidyr", "dplyr")
+#install.packages("tidyr", "dplyr")
 #Load packages
 library(tidyr, dplyr)
 ```
 
 ##Upload wide format instructor data (instructor_activity_wide.csv)
 ```{r}
-data_wide <- read.table("~/Documents/NYU/EDCT2550/Assignments/Assignment 3/instructor_activity_wide.csv", sep = ",", header = TRUE)
+data_wide <- read.table("instructor_activity_wide.csv", sep = ",", header = TRUE)
 
 #Now view the data you have uploaded and notice how its structure: each variable is a date and each row is a type of measure.
 View(data_wide)
@@ -59,7 +59,9 @@ instructor_data <- spread(data_long, variables, measure)
 ##Now we have a workable instructor data set!The next step is to create a workable student data set. Upload the data "student_activity.csv". View your file once you have uploaded it and then draw on a piece of paper the structure that you want before you attempt to code it. Write the code you use in the chunk below. (Hint: you can do it in one step)
 
 ```{r}
-
+student_data <- read.table("student_activity.csv", sep = ",", header = TRUE)
+student_data_wide <- spread(student_data, variable, measure)
+View(student_data_wide)
 ```
 
 ##Now that you have workable student data set, subset it to create a data set that only includes data from the second class. 
@@ -69,13 +71,17 @@ To do this we will use the dplyr package (We will need to call dplyr in the comm
 Notice that the way we subset is with a logical rule, in this case date == 20160204. In R, when we want to say that something "equals" something else we need to use a double equals sign "==". (A single equals sign means the same as <-).
 
 ```{r}
-student_data_2 <- dplyr::filter(student_data, date == 20160204)
+student_data_2 <- dplyr::filter(student_data_wide, date == 20160204)
+View(student_data_2)
 ```
 
 Now subset the student_activity data frame to create a data frame that only includes students who have sat at table 4. Write your code in the following chunk:
 
 ```{r}
-
+student_table <- dplyr::filter(student_data_2, variable == "table")
+View(student_table)
+student_table_4 <- dplyr::filter(student_table, measure == 4)
+View(student_table_4)
 ```
 
 ##Make a new variable
@@ -84,54 +90,68 @@ It is useful to be able to make new variables for analysis. We can either apend
 
 ```{r}
 instructor_data <- dplyr::mutate(instructor_data, total_sleep = s_deep + s_light)
+View(instructor_data)
 ```
 
 Now, refering to the cheat sheet, create a data frame called "instructor_sleep" that contains ONLY the total_sleep variable. Write your code in the following code chunk:
 
 ```{r}
-
+instructor_sleep <- dplyr::select(instructor_data, contains("total_sleep"))
+View(instructor_sleep)
 ```
 
 Now, we can combine several commands together to create a new variable that contains a grouping. The following code creates a weekly grouping variable called "week" in the instructor data set:
 
 ```{r}
 instructor_data <- dplyr::mutate(instructor_data, week = dplyr::ntile(date, 3))
+View(instructor_data)
 ```
 
 Create the same variables for the student data frame, write your code in the code chunk below:
 ```{r}
+student_data_3 <- dplyr::mutate(student_data_wide, week = dplyr::ntile(date,3))
+View(student_data_3)
 
 ```
 
 ##Sumaraizing
 Next we will summarize the student data. First we can simply take an average of one of our student variables such as motivation:
 
 ```{r}
-student_data %>% dplyr::summarise(mean(motivation))
+student_data_wide %>% dplyr::summarise(mean(motivation))
 
 #That isn't super interesting, so let's break it down by week:
 
-student_data %>% dplyr::group_by(date) %>% dplyr::summarise(mean(motivation))
+student_data_wide %>% dplyr::group_by(date) %>% dplyr::summarise(mean(motivation))
 ```
 
 Create two new data sets using this method. One that sumarizes average motivation for students for each week (student_week) and another than sumarizes "m_active_time" for the instructor per week (instructor_week). Write your code in the following chunk:
 
 ```{r}
-
+student_week <- student_data_3 %>% dplyr::group_by(week) %>% dplyr::summarise(mean(motivation))
+View(student_week)
+instructor_week <- instructor_data %>% dplyr::group_by(week) %>% dplyr::summarise(mean(m_active_time))
+View(instructor_week)
 ```
 
 ##Merging
 Now we will merge these two data frames using dplyr. 
 
 ```{r}
 merge <- dplyr::full_join(instructor_week, student_week, "week")
+View(merge)
 ```
 
 ##Visualize
 Visualize the relationship between these two variables (mean motivation and mean instructor activity) with the "plot" command and then run a Pearson correlation test (hint: cor.test()). Write the code for the these commands below:
 
 ```{r}
-
+x_value <- merge$"mean(motivation)"
+x_value
+y_value <- merge$"mean(m_active_time)"
+y_value
+plot(x_value, y_value)
+cor.test(x_value,y_value)
 ```
 
 Fnally save your markdown document and your plot to this folder and comit, push and pull your repo to submit.

class7.Rproj

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