DSCI 100 FINAL STUDY GUIDE
Sample estimate - Answers - Estimates the population parameter
Inferential question - Answers - Data analysis questions regarding how summaries,
patterns, trends, or relationships in a data set extend to the wider population
Statistical inference - Answers - Using a sample to make a conclusion about the
population from which it is taken
Point estimate - Answers - Where a summary statistic is used to estimate an unknown
population parameter
Steps to open a database in R - Answers - 1. Connect to the database using the
dbConnect function
2.
Limitations of K-NN regression - Answers - Does not predict we'll beyond the range of
the predictors in the training data
Method gets significantly slower as training data set grows
simple linear regression - Answers - one predictor variable and one response variable
line of best fit is chosen to minimize RMSE
linear_reg() model, lm engine
no standardizing
multivariable linear regression - Answers - multiple predictor variables
Multicollinearity - Answers - The term used to describe the correlation among the
independent variables. Small changes to the data can result in large changes to the
coeffecients
multivariate k-nn regression with one outcome/target variable and two predictor
variables, the predictions take the form of what shape? - Answers - a wiggly/flexible
plane
In simple linear regression with one outcome/target variable and one predictor variable,
the predictions take the form of what shape? - Answers - A straight line
In multiple linear regression with one outcome/target variable and two predictor
variables, the predictions take the form of what shape? - Answers - a flat plane
Why is clustering an unsupervised task - Answers - we are trying to understand and
examine the structure of data without any response variable labels or values to help us
Sample estimate - Answers - Estimates the population parameter
Inferential question - Answers - Data analysis questions regarding how summaries,
patterns, trends, or relationships in a data set extend to the wider population
Statistical inference - Answers - Using a sample to make a conclusion about the
population from which it is taken
Point estimate - Answers - Where a summary statistic is used to estimate an unknown
population parameter
Steps to open a database in R - Answers - 1. Connect to the database using the
dbConnect function
2.
Limitations of K-NN regression - Answers - Does not predict we'll beyond the range of
the predictors in the training data
Method gets significantly slower as training data set grows
simple linear regression - Answers - one predictor variable and one response variable
line of best fit is chosen to minimize RMSE
linear_reg() model, lm engine
no standardizing
multivariable linear regression - Answers - multiple predictor variables
Multicollinearity - Answers - The term used to describe the correlation among the
independent variables. Small changes to the data can result in large changes to the
coeffecients
multivariate k-nn regression with one outcome/target variable and two predictor
variables, the predictions take the form of what shape? - Answers - a wiggly/flexible
plane
In simple linear regression with one outcome/target variable and one predictor variable,
the predictions take the form of what shape? - Answers - A straight line
In multiple linear regression with one outcome/target variable and two predictor
variables, the predictions take the form of what shape? - Answers - a flat plane
Why is clustering an unsupervised task - Answers - we are trying to understand and
examine the structure of data without any response variable labels or values to help us
