homework 3

_site/assignments/HW3.qmd

@@ -0,0 +1,71 @@
+---
+title: "Homework 3"
+format:
+  typst:
+    fig-format: png
+    fig-dpi: 300
+    fig-width: 6
+    fig-height: 4
+---
+
+```{r}
+#| echo: false
+#| message: false
+# !! Do not edit this code chunk !!
+library(tidyverse)
+library(palmerpenguins)
+
+penguins2 <- na.omit(penguins)
+
+# data prep:
+OH_pop <- midwest |>
+  filter(state == "OH") |>
+  arrange(desc(poptotal)) |>
+  mutate(row = row_number()) |>
+  filter(poptotal >= 100000) |>
+  select(c(county, poptotal))
+```
+
+**This homework is due on Feb. 6, 2025 at 11:00pm. Please submit as a pdf file on Canvas.**
+
+**Problem 1: (8 pts)** For this Problem you will be working with the `penguins2` dataset which is equivalent to `penguins` but with `NA` values removed.
+
+```{r}
+penguins2
+```
+
+Use ggplot to make a histogram of the `body_mass_g` column. Manually choose appropriate values for `binwidth` and `center`. Explain your choice of values in 2-3 sentences.
+
+```{r}
+# Your code goes here.
+```
+
+*Your explanation goes here.*
+
+**Problem 2: (6 pts)** For Problems 2 and 3, you will work with the dataset `OH_pop` that contains Ohio state demographics and has been derived from the `midwest` dataset provided by **ggplot2**. See here for details of the original dataset: https://ggplot2.tidyverse.org/reference/midwest.html. `OH_pop` contains two columns: `county` and `poptotal` (the county's total population), and it only contains counties with at least 100,000 inhabitants.
+
+```{r}
+OH_pop
+```
+
+Create a plot that satisfies the following two requirements:
+
+(a) Use ggplot to make a scatter plot of `county` vs total population (column `poptotal`) and order the counties by the total population.
+
+(b) Rename the axes and set appropriate limits, breaks and labels. Note: Do not use `xlab()` or `ylab()` to label the axes.
+
+```{r}
+# Your code goes here.
+```
+
+**Problem 2: (6 pts)**
+
+Modify the plot from Problem 2 so it satisfies the following two requirements:
+
+(a) Change the scale for `poptotal` to logarithmic.
+
+(b) Adjust the limits, breaks, and labels so they are appropriate for the logarithmic scale.
+
+```{r}
+# Your code goes here.
+```

_site/schedule.html

@@ -386,6 +386,13 @@ <h3 class="anchored" data-anchor-id="homework-2-due-jan-30-2025">Homework 2 (due
 </section>
 <section id="homework-3-due-feb-6-2025" class="level3">
 <h3 class="anchored" data-anchor-id="homework-3-due-feb-6-2025">Homework 3 (due Feb 6, 2025)</h3>
+<p class="nospace">
+Materials:
+</p>
+<ul>
+<li><a href="assignments/HW3.qmd">Quarto template</a></li>
+<li><a href="assignments/HW3.pdf">PDF</a></li>
+</ul>
 </section>
 <section id="homework-4-due-feb-27-2025" class="level3">
 <h3 class="anchored" data-anchor-id="homework-4-due-feb-27-2025">Homework 4 (due Feb 27, 2025)</h3>

_site/search.json

@@ -1404,7 +1404,7 @@
     "href": "schedule.html#homeworks",
     "title": "SDS 366 Schedule Spring 2025",
     "section": "Homeworks",
-    "text": "Homeworks\nAll homeworks are due by 11:00pm on the day they are due. Homeworks need to be submitted as pdf files on Canvas.\n\nHomework 1 (due Jan 23, 2025)\n\nMaterials:\n\n\nQuarto template\nPDF\n\n\n\nHomework 2 (due Jan 30, 2025)\n\nMaterials:\n\n\nQuarto template\nPDF\n\n\n\nHomework 3 (due Feb 6, 2025)\n\n\nHomework 4 (due Feb 27, 2025)\n\n\nHomework 5 (due Mar 6, 2025)\n\n\nHomework 6 (due Apr 3, 2025)\n\n\nHomework 7 (due Apr 10, 2025)"
+    "text": "Homeworks\nAll homeworks are due by 11:00pm on the day they are due. Homeworks need to be submitted as pdf files on Canvas.\n\nHomework 1 (due Jan 23, 2025)\n\nMaterials:\n\n\nQuarto template\nPDF\n\n\n\nHomework 2 (due Jan 30, 2025)\n\nMaterials:\n\n\nQuarto template\nPDF\n\n\n\nHomework 3 (due Feb 6, 2025)\n\nMaterials:\n\n\nQuarto template\nPDF\n\n\n\nHomework 4 (due Feb 27, 2025)\n\n\nHomework 5 (due Mar 6, 2025)\n\n\nHomework 6 (due Apr 3, 2025)\n\n\nHomework 7 (due Apr 10, 2025)"
   },
   {
     "objectID": "schedule.html#projects",

assignments/HW3.qmd

@@ -0,0 +1,71 @@
+---
+title: "Homework 3"
+format:
+  typst:
+    fig-format: png
+    fig-dpi: 300
+    fig-width: 6
+    fig-height: 4
+---
+
+```{r}
+#| echo: false
+#| message: false
+# !! Do not edit this code chunk !!
+library(tidyverse)
+library(palmerpenguins)
+
+penguins2 <- na.omit(penguins)
+
+# data prep:
+OH_pop <- midwest |>
+  filter(state == "OH") |>
+  arrange(desc(poptotal)) |>
+  mutate(row = row_number()) |>
+  filter(poptotal >= 100000) |>
+  select(c(county, poptotal))
+```
+
+**This homework is due on Feb. 6, 2025 at 11:00pm. Please submit as a pdf file on Canvas.**
+
+**Problem 1: (8 pts)** For this Problem you will be working with the `penguins2` dataset which is equivalent to `penguins` but with `NA` values removed.
+
+```{r}
+penguins2
+```
+
+Use ggplot to make a histogram of the `body_mass_g` column. Manually choose appropriate values for `binwidth` and `center`. Explain your choice of values in 2-3 sentences.
+
+```{r}
+# Your code goes here.
+```
+
+*Your explanation goes here.*
+
+**Problem 2: (6 pts)** For Problems 2 and 3, you will work with the dataset `OH_pop` that contains Ohio state demographics and has been derived from the `midwest` dataset provided by **ggplot2**. See here for details of the original dataset: https://ggplot2.tidyverse.org/reference/midwest.html. `OH_pop` contains two columns: `county` and `poptotal` (the county's total population), and it only contains counties with at least 100,000 inhabitants.
+
+```{r}
+OH_pop
+```
+
+Create a plot that satisfies the following two requirements:
+
+(a) Use ggplot to make a scatter plot of `county` vs total population (column `poptotal`) and order the counties by the total population.
+
+(b) Rename the axes and set appropriate limits, breaks and labels. Note: Do not use `xlab()` or `ylab()` to label the axes.
+
+```{r}
+# Your code goes here.
+```
+
+**Problem 2: (6 pts)**
+
+Modify the plot from Problem 2 so it satisfies the following two requirements:
+
+(a) Change the scale for `poptotal` to logarithmic.
+
+(b) Adjust the limits, breaks, and labels so they are appropriate for the logarithmic scale.
+
+```{r}
+# Your code goes here.
+```

schedule.qmd

@@ -63,6 +63,11 @@ All homeworks are due by 11:00pm on the day they are due. Homeworks need to be s
 
 ### Homework 3 (due Feb 6, 2025)
 
+<p class="nospace">Materials:</p>
+
+- [Quarto template](assignments/HW3.qmd)
+- [PDF](assignments/HW3.pdf)
+
 ### Homework 4 (due Feb 27, 2025)
 
 ### Homework 5 (due Mar 6, 2025)