Average observations: Set the low observation equal to the average of the observations in the corresponding high observations. i.e. take the average of Jan 2009, Feb 2009, and March 2009 and put them into 2009Q1.
Sum observations: Set the low observation equal to the sum of the observations in the corresponding high observations. i.e. take the sum of Jan 2009, Feb 2009, and March 2009 and put them into 2009Q1.
First observation: Set the low observation equal to the value in the first of the corresponding high observations. i.e. take the value of Jan
2009 and put it into 2009Q1.
Last observation: Set the low observation equal to the value in the last of the corresponding high observations. i.e. take the value of March 2009 and put it into 2009Q1.
Max observation: Set the low observation equal to the maximum of the corresponding high observations. i.e. take the max of Jan 2009, Feb 2009 and March 2009 and put it into 2009Q1.
Min observation: Set the low observation equal to the minimum of the corresponding high observations. i.e. take the min of Jan 2009, Feb 2009 and March 2009 and put it into 2009Q1.

http://forums.eviews.com/viewtopic.php?t=3799
Average observations: Set the low observation equal to the average of the observations in the corresponding high observations. i.e. take the average of Jan 2009, Feb 2009, and March 2009 and put them into 2009Q1.
Sum observations: Set the low observation equal to the sum of the observations in the corresponding high observations. i.e. take the sum of Jan 2009, Feb 2009, and March 2009 and put them into 2009Q1.
First observation: Set the low observation equal to the value in the first of the corresponding high observations. i.e. take the value of Jan
2009 and put it into 2009Q1.
Last observation: Set the low observation equal to the value in the last of the corresponding high observations. i.e. take the value of March 2009 and put it into 2009Q1.
Max observation: Set the low observation equal to the maximum of the corresponding high observations. i.e. take the max of Jan 2009, Feb 2009 and March 2009 and put it into 2009Q1.
Min observation: Set the low observation equal to the minimum of the corresponding high observations. i.e. take the min of Jan 2009, Feb 2009 and March 2009 and put it into 2009Q1.

您好！我的数据是三年一次，请问怎样转换为季度数据呢？感谢指导