Sample Selector

Sample Selector is a tool for creating and editing samples, or groups of data you compare across—they're not "samples" in the statistical sense, but more like filters.

By default, a single sample exists: "All Data". With the Sample Selector, you can create new samples to organize your data.

You can use samples to:

A sample is composed of one or more filters, specific conditions that narrow down your sample.

Creating a sample

The general process for creating a sample is to:

The effect of multiple filters

DataShop interprets each filter after the first as an additional restriction on the data that is included in the sample. This is also known as a logical "AND". You can see the results of multiple filters in the sample preview as soon as all filters are "saved".

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Logging Activity

When activated, this report provides a logging diagnostic by displaying counts of all recent log messages received by the logging server, organized by dataset and student session. It is intended for use by technical researchers or staff who are in the process of verifying logging activity from a study site.

Since this report is generated by querying the live logging database, and using it has the potential to affect that database, we are requesting that you agree to follow the guidelines at the top of the page before using the page.

Column Descriptions

Session ID
A unique identifier that identifies the student session with the tutor. Although this varies by logging implementation, expect one session ID for every student session (an instance of a user logged in and generating log data). Although session ID should be a guaranteed unique identifier (a GUID), a duplicate session ID is possible, and the presence of duplicates could skew the data in this report.
First Message Receipt Time
The time on the DataShop server when the first message of the session was received. Note that this is first message for the session within the specified time frame.
Last Message Receipt Time
The time on the DataShop server when the last message of the session was received.
Total
The total number of log messages (Context, Tool, Tutor, and Plain messages) received within the specified time frame.
Context
The number of context messages received within the specified time frame. A typical number of context messages is one per problem or activity.
Tool
The number of tool messages received within the specified time frame. A typical number of tool messages is one per click or other student action.
Tutor
The number of tutor messages received within the specified time frame. A typical number of tool messages is one per click or other student action.
Plain
The number of plain messages received within the specified time frame. The number of plain messages, or generic messages repurposed by the tutoring system, varies more widely than the other message types. For most systems, this message type should be used far less than the other types.