Lesson 2 Flashcards
It measures the relationship between variables.
Correlation
It predicts the outcome or effect of variable to another variable.
Regression
It is a statistical tool to measure the association between variables.
Correlation
It is concerned with the relationship in the changes and movements of two variables.
Correlation
It measures the extend of relationship between variables.
Correlation
What are the two types of correlation tests?
- Pearson - Product Moment Correlation
- Spearman Rho Correlation
It is a type of data focused on descriptions or used to label variables without any order or quantitative value.
Nominal data
It is a type of data where data can be put in order or when data have natural ordering.
Ordinal data
These are data that contain the values that fall under integers or whole numbers.
Discrete
These are data in the form of fractional numbers or decimals.
Continuous
We can only use this correlation test strictly for discrete and continuous data.
Pearson-product moment correlation
In this correlation test, nominal and ordinal data are accepted.
Spearman Rho Correlation
It measures the nature and strength between two variables of the quantitative type.
Pearson’s Correlation / Product Moment Correlation Coefficient
It measures the degree of linear association.
Pearson’s Correlation / Product Moment Correlation Coefficient
It is denoted by r.
Pearson’s Correlation / Product Moment Correlation Coefficient
What is the range of rho when using Pearson’s Correlation?
ranges from +1.0 (positive) to -1.0 (negative)
What does the sign of r denotes in Pearson’s Correlation?
nature of association
What does the value of r denotes in Pearson’s Correlation?
strength of association
In this correlation, when x increases, y also increases.
Positive correlation
It is correlation with direct variable.
Positive Correlation
What value of r gives a perfect positive correlation?
1
In this correlation, when the x increases, the y decreases.
Negative Correlation
It is a correlation with indirect variable.
Negative Correlation
What is the value of a perfect negative correlation?
-1
In this correlation, there is an absence of any systematic tendency.
Zero Correlation
Explain the arbitrary scale for the interpretation of r.
+-1.00 - Perfect Positive/Negative Correlation
+-0.70 to +-0.99 - Strong/High Positive/Negative Correlation
+-0.40 to +-0.69 - Moderate Positive/Negative Correlation
+-0.01 to +-0.39 - Slight/Low Positive/Negative Correlation
0 - No Correlation
It is a non-parametric measure of correlation.
Spearman Rank Correlation Coefficient
How is Spearman Rank Correlation Coefficient denoted?
rsub(s)
Spearman Rank Correlation Coefficient could be computed in the following cases.
- Both variables are quantitative
- Both variables are qualitative ordinal
- One variable is quantitative and the other is qualitative ordinal
It is a technique concerned with predicting some variables by knowing others.
Regression
It tells you how values in y changes as a function of changes in values of x.
Regression
It used for prediction.
Regression
True or False. You can predict something even though variables have no correlation.
False
What is line of best fit in linear regression?
y = mx + b
