Publications by Laboratory Exercise No. 5
Stat 221- Linear Regression Analysis
Motivation In correlation analysis, we are able to say that one variable is linearly related to another Correlation does not imply causation As the value of one variable increases (decreases), so does the value of the other variable We avoid to use the term dependent and independent to refer to the variables in a correlation analysis How much...
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Stat 141- Problem Set No. 5
INSTRUCTIONS: Write your solutions in RMarkdown. Submit as pdf or html. If you used html format, publish your html document in Rpubs.com and attach the link of your file in the VSUEE assignment. Problem No.1 The surface finish of metal parts made on four randomly selected machines is being studied. An experiment is conducted in which each ma...
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Stat 141 Analysis of Covariance
Quick review Nuisance factor- factor that may have an effect on the response variable but of not an interest to the researcher Unknown and uncontrollable- randomization balances out its impact across the experiment Known and controllable- blocking or grouping of the experimental units using the nuisance factor as grouping variable Known but...
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Stat 141- ANSWER KEY (Problem Set No. 4)
INSTRUCTIONS: Write your solutions in RMarkdown. Submit as pdf or html. If you used html format, publish your html document in Rpubs.com and attach the link of your file in the VSUEE assignment. Problem No.1 Derive the expected mean squares of a three-factor factorial experiment where factors A and B are random and C is fixed. SOLUTION: R ...
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Stat 141 Split-Plot Experiments
Basic ideas a two-factor experiment wherein levels of one of the factors require large plot size for execution and also show large differences in their effects the experiment will consist of a set of large plots called main plots in which levels for the main plot factor are assigned each main plot is divided into subplots to which the secon...
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Stat 141 Experiments with Nested Factors
Nested (hierarchical) factors Recall that in a factorial experiment, the levels of factor A are “crossed” with the levels of factor B In some two-factor experiments the level of one factor , say B, is not “cross” or “cross classified” with the other factor, say A, but is “NESTED” with it. Nesting may occur in the treatment str...
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Stat 221 Problem Set No. 7
INSTRUCTIONS: Type your answer on an A4-size bond paper. Use single-space, Arial with 11 as font size. Follow the steps in hypothesis testing. Copy and paste screenshots of JASP output into your answer sheet. Problem No. 1 Absenteeism of undergraduate students from statistics classes is a major concern to instructors. Suppose that a study...
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Stat 137- Plotting Systems in R
Introduction There are three different plotting systems in R and they each have different characteristics and modes of operation. They three systems are the base plotting system, the lattice system, and the ggplot2 system. The Base Plotting System The base plotting system is the original plotting system for R. The basic model is sometimes re...
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Data Visualization Using ggplot2
Plotting One Variable Introduction To visualize one variable, the type of graphs to be used depends on the type of the variable: For categorical variable or grouping variables. You can visualize the count of categories using a bar plot or using a pie chart to show the proportion of each category. Dot charts can be another alternative. For c...
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Stat 131 Problem Set No. 4 KEY ANSWER
Problem No. 1: According to one article published in SN Comprehensive Clinical Medicine journal, the biological differences in the immune systems between men and women may impact the ability to fight an infection including SARS-2-CoV-2. Generally, females are more resistant to infections than men, and this is possibly mediated by several fac...
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