Summary
Summary data analysis
- Course
- Institution
- Book
course mathematics and data analysis economics and busisseconomics
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
STA1510 EXAM PACK 2024
-
STA1610 EXAM PACK 2024
-
STA1501 EXAM PACK 2023
Seller
Follow
suzevandervlugt
Reviews received
Content preview
Data AnalysisCases: The objects described by a set of data, customers
Variable: A characteristic of a case, profit
Distribution of a variable: the values the variable takes and how often it takes them
Quantitative Variable: Takes numerical values for which we can do arithmetic, age
histograms, stemplots, time plots
Categorical Variable: Places a case into one of several groups or categories, own home
bar graphs and pie charts
Bar graphs: Each category is represented by a bar.
Pie charts; the slices must represent the parts of one whole
Histograms and stemplots: These are summary graphs for a single variable. They are very
useful to understand the pattern of variability in the data.
- Histograms; The range of values that a variable can take is divided into equal size
intervals. The histogram shows the number of individual data points that fall in each
interval.
shape, center, and spread. symmetric, skewed left, skewed right, two peakz, outlier
- stemplot, quantitative data, small data quick and easy, can see the data values
outliers: observations that lie outside the overall pattern of a distribution
Line graphs: time plots. Use when there is a meaningful sequence, like time. The line
connecting the points helps emphasize any change over time. x-as time. scales matter
trend: a rise or fall that persists over time
seasonal variation: A pattern that repeats itself at regular intervals of time
mean; average, center of mass
median is midpoint of distribution, half are smaller and half larger
even: n/2 odd (n+1)/2
mean and median only same if distribution is symmetrical. median is resistant to outliers
percentiles:what data value has a certain percent of the data at or below it
quartiles: 1 quartile 25%, third quartile 75%
5 number summary: largest, third quartile, median, first quartile, lowest. min Q1 M Q3 max
boxplot
interquartile range: difference between quartiles 1 and 3, for outliers
suspected outliers: outliers more than 1,5 times the size of IQR
standard deviation s: variation around the mean
not resistant to outliers
has te same units of measurement as the original observations
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller suzevandervlugt. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.23. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67096 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now