Recent content by PCA1

  1. P

    Starting to understanding Factor Analysis. Yeah!

    That is great! My solving of the linear equations gives similar answers to the answers in my above post. Looks like standardizing the variables helped. There is still quite a bit of jumping around of these factor scores according to which pair of linear equations are solved. For example...
  2. P

    Starting to understanding Factor Analysis. Yeah!

    % Now I am including the standardized grades gradestan<- data.frame(c(-1.14763,-0.26726,-0.34412),c(0.12751,-1.60356,-1.49117),c(1.08387,1.06904, + 1.37646),c(-1.14763,1.06904,0.80294),c(1.08387,-0.26726,-0.34412)) newgrades <- t(gradestan) cor(newgrades) % Here is the factor analysis call...
  3. P

    Starting to understanding Factor Analysis. Yeah!

    % I calculated the factorscores with the built in function. % This result did not make a great deal of sense to me. % The third student received marks of 10, 9 and 8. % Why did they receive PC1 and PC2 scores that were lower than e.g, student 5 who received grades of 10,6, and 5...
  4. P

    Starting to understanding Factor Analysis. Yeah!

    Here's my due diligence. I worked the example from the pdf in my previous post in R. Here's the code. % Entered Grades % I used the data.frame entry because I wanted to do some programming later and % R did not seem to like it when I tried to take sub-matrices using a "matrix" declaration...
  5. P

    Starting to understanding Factor Analysis. Yeah!

    I have wanted to understand factor analysis for quite some time, though I have never actually gotten around to it-- until recently. Part of the problem is that much of the web content on FA is not overly helpful; it concentrates more on how to code the answer than providing actual insight into...
  6. P

    Are students prepared for college? PCA analysis?

    So awesome! This is THE age of learning. There are opportunities to grow and learn in ways that simply were not reasonably available to people in the past. Clearly, I am just not engaging with my online sociology course. The course textbook's 2 page description of the author's struggle to...
  7. P

    Are students prepared for college? PCA analysis?

    Wow! I am not sure if Stack Exchange -- Cross Validated(CV) is somehow connected to this forum, though I have found CV to be an incredibly useful resource to deepen my understanding of PCA. It is brilliant! Let people ask questions and then let the best answers rise to the top. My impression is...
  8. P

    Are students prepared for college? PCA analysis?

    Thank you again for your reply, GretaGarbo. Going through the process of writing down one's ideas helps to crystallize them. I had to take a vacation from the course for a while because I found it too disturbing. Sociology has to be the craziest subject that I have ever taken-- by far. In the...
  9. P

    Are students prepared for college? PCA analysis?

    GretaGarbo, Thank you for suggesting RStudio to me! I downloaded the software and have found that it does add a layer of polish to the R interface. If RStudio can do everything in the background for me related to packages, this alone would be a great help to me. Without it I needed to keep...
  10. P

    Are students prepared for college? PCA analysis?

    Very startling how much can be learned on the internet in a few days! Web learning is way way better than a classroom. I have watched about 20 videos on PCA and I am developing a feel for it. Great having 20 or so people explaining the same thing to you. Each slightly different perspective...
  11. P

    Are students prepared for college? PCA analysis?

    Very exciting! I have been able to get over the hurdle about the installing of the packages and I am now able to see the analysis of the data! Excellent! If I can follow the template in my assignment, then I will have no worries!
  12. P

    Are students prepared for college? PCA analysis?

    Very awesome news! While looking around on some online videos on PCA, I came across one that went through an example in R. I have downloaded R and I am following along with the code! This is great great! Perhaps I can simple lift over the template from the video and I will be all done. I am...
  13. P

    Are students prepared for college? PCA analysis?

    Buckeye, thank you very much for your reply! I do not have a firm grasp of principal component analysis. Ordinarily, this would be a gamestopper for me. However, the sociology course that I am currently enrolled in is not intended to be a deep statistical theory course. The assignment is merely...
  14. P

    Are students prepared for college? PCA analysis?

    I have an assignment for my online sociology course that requires that I complete a quantitative analysis on a social issue. For my assignment, I have decided to investigate the level of preparedness of my fellow classmates for university study. The motivation for this research arose when I...