Geog 215 Final - Assesments

RStudio

A programming environment (IDE) to help write and develop code

RMarkdown

A formatting language that allows code and text to be knitted into readable output

R

A computer language designed for statistical programming and data visualization

my value

What is not a valid variable name in R

quizGrade <- 5

Assign the value of 5 to the variable quizGrade

#

Symbol for comments

a. 100 <- 10

b. (download) <- file

c. print 10

d. sqrt (100) (CORRECT)

What is a valid FUNCTION call in R?

Integer

What type of variable name is x <- 100

Boolean/logical

What type of variable name is a <- true

floating point

What type of variable name is z <- 3.4

String/text

What type of variable name is y -"St. Louis"

b <- x*z

Write the code that would multiply x and z and put the result into a new variable called b

glimpse ()

Which tidyverse function lets you peek into the structure of the datasets?

select ()

Which tidyverse function lets you keep specific columns of data

mutate ()

Which tidyverse function lets you create and calculate values in a new column

flights |>

filter (month == 1)

Write and R code to filter just the first month (column month) out of a dataset called flights

myData |>

select (day, month, year) |>

glimpse()

Which of the following is a valid tidyverse code?

model

a representation of a process of phenomenon

outlier

An observation that falls far from the line of best fit for a model

residual

Distance from the line of best fit

linear regression

Creates a mathematical formula to see how independent variables impact a dependent variable

standard deviation

The most common method of measuring disparities or variability in a dataset is which of the following statistics?

What type of variation occurs within my variables?

Are there missing values in the dataset?

Which of the following questions are used to guide an Exploratory data analysis?

- What type of variation occurs within my variables?

- Who created the dataset?

- When was the created?

- Are there missing values in the dataset?

True

True or false: you can include all of your data, code, results, and write-up (Intro, Background, Data and Methods, Results, and Conclusion) in an RMarkdown file.

- Location is messy!

- Spatial Data often has spatial autocorrelation.

Why is spatial data "special"? SELECT ALL THAT APPLY

- Location is messy!

- Spatial Data often has spatial autocorrelation.

- Spatial data only applies to datasets that have latitude and longitude

- Spatial data exists separately from temporal data.

About 46 percent

how much variance in median.home.value does the model explain

Positively related.

Is the yearof.home positively or negatively related to the median.home.value?

year.of.home

For the regression results above, which variables significantly impact the median.home.value?

.0000186

In the ANOVA results above, what is the numerical value of the p-value (ie, probability, not due to char….)

Yes

For the ANOVA results above, would we say that the median.age.male variable is statistically different between two or more classes?

Reproducible

Obtaining the same results with the same data methods

Replicable

Obtaining consistent results across multiple studies

Open Source

Software that is free to use and modify

Open access

Published research that is free to read and redistribute

Weighted Mean Center

The population center of the US is an example of which spatial statistic?

Standard deviation

The most common method of measuring dispersion or variability in a dataset is what?

What type of variation occurs within my variables?

Are there missing values in the dataset?

Which of the following questions are used to guide an Exploratory Data Analysis? (SELECT ALL THAT APPLY)

What type of variation occurs within my variables?

Who created the dataset?

When was the data created?

Are there missing values in the dataset?

IQR

The difference between the 75th and the 25th percentiles of a dataset are called its…

Equidistant

What map distortion is best preserved with distance?

Conformal

What map distortion is best preserved with shape?

equal-area

What map distortion is best preserved with area?

azimuthal

What map distortion is best preserved with direction?

Ellipsoid

The best model for the shape of the earth is used by computers commonly is…

False

True or False: table joins require both layers to be in the same projection in order to work

graticule

The lines placed on the map that represent longitude and latitude (or other X/Y values) are called the…

false

True or false: when working with spatial data, measuring distance in decimal degrees guarantees the most accurate results

Data structure that uses an open, standard format.

Data structure that stores vector data.

a GeoJSON is a…

Data model for raster data.

Data structure that uses an open, standard format.

Data structure that stores vector data.

Data abstraction for collected imagery.

table join

A join connecting two or more tables using attribute data.

Cardinality

The relationship between entities in a relational database

key

An attribute used to join tables.

Spatial Join

A join connected two or more tables via their locations.

True

True or false: the smaller the cell size in a raster, the better the resolution

attribute

a property of spatial data, often stored in columns in a table, is called a(n)

vector

model used for discrete data

raster

model used for continuous data

entities

real world objects

representation

features

true

True or false: regression models assume that the independent variables are unrelated to each other

Positively related

is the year.of.home positively or negatively related to the median.home.value?