# CS代写|数据可视化代写Data visualization代考|EDS240

## CS代写|数据可视化代写Data visualization代考|Diverging Color Schemes

When working with a quantitative variable for which there is a meaningful reference value, such as a target value or the mean, a diverging color scheme (or diverging color palette) should be used. A diverging color scheme is essentially a gradient formed by the combination of two sequential color schemes with a shared endpoint at the reference value. These color schemes use two hues, one of which is associated with values below the reference value and the other of which is associated with values above the reference value. As the value of the variable increases, the luminance of the hue associated with values below the reference value progressively increases and the color becomes lighter until we cross the reference point. At that point, the luminance of the hue associated with values above the reference point progressively decreases and the color becomes darker. Thus, the hue communicates the direction of deviation from the reference point, and the luminance conveys the relative deviation from the reference point. For this reason, the hues used on each side of the reference point in a diverging color scheme are typically distinctive; primary hues are often used to make it easier to distinguish the direction and degree of deviation from the reference point.
Diverging color schemes are most effective when highlighting both extremes (high and low values) of a variable. Continuing with another temperature example, consider the monthly mean daily low Fahrenheit temperatures for Indianapolis for each year from 2010-2019 in Table 4.1. ${ }^2$

We can use the following steps to build a heat map of these data in Excel.
Step 1. Select cells B2:M11
Step 2. Click the Home tab on the Ribbon and click Conditional Formatting in the Styles group
Step 3. Click Color Scales and select More Rules
Step 4. When the New Formatting Rule dialog box opens, in the Edit the Rule Description box
Select 3-Color Scale from the Format Style drop-down menu
Select a blue hue to be associated with values below the reference point from the Color drop-down menu in the Minimum column
Select Number from the Midpoint drop-down menu for Type, enter 32 in the Value box, and select white to be associated with values near the reference point from the Color drop-down menu
Select a red hue to be associated with values above the reference point from the Color drop-down menu in the Maximum column Check the Preview bar to ensure you have created the diverging color gradient you desire
Click OK
This creates a heat map with the values in the cells. To format the values so they do not appear in the cells:

Step 5. With cells B2:M11 still selected, right-click any cell in B2:M11 and select Format Cells…
Click the Number tab, then click Custom in the Category box Enter; in the Type box
Click OK These steps produce the heat map with a diverging color scheme shown in Figure 4.14.

## CS代写|数据可视化代写Data visualization代考|Unnecessary Color

Data visualization experts agree that color should only be used when it communicates something that no other aspect of a chart communicates to the audience. Figure $4.21$ shows the number of units sold (in thousands) for seven top-selling midsize sedans.

In this chart, the audience can discern which column corresponds to each of the models through the colors of the columns and the legend. Although this communicates the data.we can accomplish the same communication with a chart that creates less cognitive load by avoiding the use of multiple colors. If we clearly label the columns on the horizontal axis, then there is no need for a different color for each model of sedan.

The chart shown in Figure $4.22$ uses only horizontal-axis labels to communicate the association between the columns and the models. The audience now does not have to look back and forth between the columns and the legend to make these associations in this chart, which reduces the audience’s cognitive load.Note that one could produce a chart that includes both the colors and legend of Figure $4.21$ and the horizontal-axis labels of Figure $4.22$, but this would embed redundant information in the chart and further decrease its data-ink ratio.

There is a limit to the amount of information that can be communicated to the audience using color. Suppose you are analyzing quarterly house-price indexes from 1992-2019 for each state and the District of Colombia, and you want to emphasize the westernmost states in the continental United States (Arizona, California, Nevada, Oregon, and Washington). The chart in Figure $4.23$ shows the quarterly house-price index from 1992-2019 for each state and the District of Colombia. ${ }^3$ The chart captures information on house-price index by state for each quarter of the 28-year period ( 112 quarters). It enables the audience to quickly see that on a national level house prices increased steadily until around 2004 , when the rate of increase accelerated dramatically until sometime around 2007 . The audience can also see that the housing market then crashed and house prices generally fell for about four to five years, until they began to increase again sometime around 2010 .

# 数据可视化代考

## CS代写|数据可视化代写Data visualization代考|Diverging Color Schemes

“最小值”列的“颜色”下拉菜单中选择要与低于参考点的值相关联的蓝色色调

”这将创建一个热图，其中的值细胞。要格式化值，使它们不出现在单元格中：

## CS代写|数据可视化代写Data visualization代考|Unnecessary Color

myassignments-help数学代考价格说明

1、客户需提供物理代考的网址，相关账户，以及课程名称，Textbook等相关资料~客服会根据作业数量和持续时间给您定价~使收费透明，让您清楚的知道您的钱花在什么地方。

2、数学代写一般每篇报价约为600—1000rmb，费用根据持续时间、周作业量、成绩要求有所浮动(持续时间越长约便宜、周作业量越多约贵、成绩要求越高越贵)，报价后价格觉得合适，可以先付一周的款，我们帮你试做，满意后再继续，遇到Fail全额退款。

3、myassignments-help公司所有MATH作业代写服务支持付半款，全款，周付款，周付款一方面方便大家查阅自己的分数，一方面也方便大家资金周转，注意:每周固定周一时先预付下周的定金，不付定金不予继续做。物理代写一次性付清打9.5折。

Math作业代写、数学代写常见问题

myassignments-help擅长领域包含但不是全部: