Diaries 12

 

                               Field Diaries #12


Thursday, March 09, 2021

Topic: Regression

Objective: Analyse the Regression in statistics 

Blogger.com

moodle.utmachala.edu.ec

Google.com

Brief Summary of what was exposed in classes

Regression analysis

It fits a line on this messy dot plot, X is called the independent or predictor variable, and Y is the dependent variable or response to the regression line.

The idea is to minimize the total distance of the Y values to the line, find the squared distances of ay to the line and guamis it to obtain the sum of squared errors (SSE).


ANOVA

It is the ratio of the relative error to the total dispersion.

Coefficient of determination

It is the ratio of all the SSyy explainable by the regression. R2 is always less than 1, the closer it is to 1 the more accurate the curve fit. R2= 1 corresponds to perfect fit.

Correlation coefficient

It is the square root of R2 with 3l sign of b. Then r is positive if the line is ascending to the right, and negative if the line is descending to the right.

Personal Conclusions

The class was very entertaining due to the dynamics of the class. We learned a lot about regression and how to calculate it.

Task

Practising what you have learned. 

                                  

Comentarios

Publicar un comentario

Entradas populares de este blog

Diaries 11

Imagen
                                          Field Diaries #11 Thursday, March 04, 2021 Topic : Descriptive statistics Objective : Perform descriptive statistical processes with the use of the R Studio tool.  Shared resources: Blogger.com moodle.utmachala.edu.ec R Studio Brief Summary of what was exposed in classes We did statistical calculations that we have done before, but thanks to this location everything was done with just one click. First we had to put the text code and then execute it. With a specific code we can perform any statistical calculation, such as calculating the median, mean, dispersion or perform a Box and Whiskers plot. Personal Conclusions We learned briefly how to use a software, which will help us a lot to make calculations very fast and it will be more dynamic to do a job. Task Practising what you have learned.            ...
Leer más

Diaries 3

  Field Diaries # 3 Tusday, January 19, 2021. Topic: S tatistical Terminology     Objetive: L earn to establish the size of a sample based on a population. Sared resources: Blogger.com Brief summary of what was exposed in classes. What is a population? A population is the set of elements, indiciduals and objects that have the same characteristics about which we are interested in obtaining conclusions. What is a sample? A sample is a part of the population which is selected for the purpose of obtaining information. Personal conclusions Today's topic seemed quite timely because it helps me determine how I can organize my subject.
Leer más

Diaries 7

                                                                  Field Diaries #7 Thursday, February 09, 2021 Topic : Statistical parameters Objective : Analyse the median, mode and mean. Shared resources: Blogger.com moodle.utmachala.edu.ec Google.com Brief Summary of what was exposed in classes The Mean The mean is obtained by dividing the sum of all data by the number of observations.  Observations: 3, 5, 6, 10  Mean: 24/4 = 6 The Median  In a set of numbers it is the middle number in the set (after the numbers have been arranged from smallest to largest) or, if there is an even number of data, the median is the average of the two middle numbers.  Find the median of the set (2, 5, 8, 11, 16, 21, 30) . There are 7 numbers in the set, and these are arranged in ascending order. The middle number (the fou...
Leer más