DataShop @CMU

Transaction format

October 2013

• Added Transaction Id column.
• Level(level_name) changed to Level (level_name)
• KC(model_name) changed to KC (model_name)
• KC Category(model_name) changed to KC Category (model_name)
• CF(custom_field_name) changed to CF (custom_field_name)

June 2013

• Removed ".0" from the end of timestamps in the columns Time and Problem Start Time.

July 2011

• Added Problem View column.
• Added Problem Start Time column.

January 2010

• Renamed # to Row.
• Renamed Total # Hints to Total Num Hints.

August 2009

• Added Duration (sec) column.

Student-step format

October 2013

• Knowledge Component(model_name) changed to KC (model_name), with multiple KCs on a step separated by two tildes ("~~").
• Opportunity(model_name) changed to Opportunity (model_name), with multiple KCs on a step separated by two tildes ("~~").
• Predicted Error Rate(model_name) changed to Predicted Error Rate (model_name), with multiple KCs on a step separated by two tildes ("~~").

June 2013

• Removed ".0" from the end of timestamps in the columns Step Start Time, First Transaction Time, Correct Transaction Time, and Step End Time.

January 2010

• Renamed # to Row.
• Added Condition.

August 2009

• Renamed Assistance Time (sec) to Step Duration (sec).
• Renamed Correct Step Time (sec) to Correct Step Duration (sec).
• Added Error Step Duration (sec) column.
• Removed Step Time, which was the time of the first correct attempt or, in the absence of a correct attempt, the final transaction on that step.
• Added Correct Transaction Time.

Student-problem format

October 2013

• Avg Correct changed to Avg Corrects

June 2013

• Removed ".0" from the end of timestamps in the columns Problem Start Time and Problem End Time.
• Added Condition column.

January 2010

• Renamed # to Row.

KC Model export

October 2013

• KC Model (model_name) changed to KC (model_name)
• Avg. Incorrects changed to Avg Incorrects
• Avg. Hints changed to Avg Hints
• Avg. Corrects changed to Avg Corrects
• Avg. Step Duration (sec) changed to Avg Step Duration (sec)
• Avg. Correct Step Duration (sec) changed to Avg Correct Step Duration (sec)
• Avg. Error Step Duration (sec) changed to Avg Error Step Duration (sec)

August 2009

• Renamed Avg Assistance Time to Avg Step Duration.
• Renamed Avg Correct Step Time to Avg Correct Step Duration.
• Added Avg Error Step Duration.