Factor Analysis Documentation
back to factor analysis
Enter data
Enter your test data into the textarea box in a tabdelimited format. It is easiest to do this by copying and pasting data from a spreadsheet.
Data should be formatted as shown below. It should NOT include scores, but rather just the raw data. The first line contains the question numbers on the test. The second line contains the answer key. Subsequent lines are students' names and responses.
Name 1 2 3 4 5
Key b e d d c
name1 c c c c
name2 d b e c d
name3 d e e e
name4 a b d e c
name5 d a d c c
You can include as many questions as you want and as many students as you want. Blank responses should be included since the program handles them accordingly.
Brief Explanation of Factor Analysis
The results of a factor analysis calculation are presented in a table.
The columns of this table (headed by letters) represent the factors identified
by the analysis. The rows represent the variables that the factors affect
and are named as the variables in the input matrix.
The numbers in the table represent the loadings of each factor to each
variable. A factor loading can be thought of as the amount which that
factor contributes to the values presented by a variable. The higher the
factor loading, the more that factor contributes to the value of that
variable.
For example, a factor loading close to 1 means that when the specified
factor is high (or low), the corresponding variable is also high (or low).
Remember, factor analysis provides NO insight into
the interpretation of the factors. That is, it does not tell you what
the factors are, only that they exist.
