File:  [LON-CAPA] / loncom / html / adm / help / tex / Statistics_Sequence.tex
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Sun Jun 19 17:58:59 2005 UTC (19 years ago) by felicia
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CVS tags: version_2_1_X, version_2_1_99_2, version_2_1_99_1, version_2_1_99_0, version_2_1_3, version_2_1_2, version_2_1_1, version_2_1_0, version_2_0_X, version_2_0_99_1, version_2_0_2, version_2_0_1, version_2_0_0, version_1_99_3, version_1_99_2, version_1_99_1, version_1_99_0, HEAD
Edited a bunch of help files and added many new ones so the cc manual no contains everything that my Training Guide contains. Next step is to edit the files for readability and consistancy in format.

\label{Statistics_Sequence}

The \textbf{Overall Problem Statistics} page lets you view performance 
statistics on all problems.  This page displays the following 
data about the \textbf{Folders/Sequences} selected for evaluation:

\begin{itemize}

\item \textbf{\#Items}

The number of assessment items (problem parts) in the sequence.

\item \textbf{Score} and \textbf{Count} Statistics

For both the score, the product of the problem weight and the percent awarded,
and the count, the number of problem parts correct, the following data are 
computed:

\begin{itemize}
    \item \textbf{MEAN}

    \item \textbf{Standard Deviation}

    \item \textbf{Maximum}

    The highest achieved score or count in the data set.

    \item \textbf{Minimum}

    The lowest achieved score or count in the data set.

    \item \textbf{N}

    The number of students evaluated.

\end{itemize}

\item \textbf{KR-21}

This statistic measures the internal reliability of the data set.
\textbf{This statistic is relevant for exams only.}  Let $K$ be the
number of items in your test, $M$ the mean score on the test, $s$ the
standard deviation of the scores on your test, then the KR-21
statistic, $rk$, is given by the formula

$$ rk=\frac{K}{K-1}\cdot \frac{1-(M*(K-M))}{Ks^2} $$

\end{itemize}

You have the option to have this statistical data output to an Excel file. \\

Clicking on the problem name will open a view of the problem in a separate window. 

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