I have two year data and performed statistics on each year data individually. Now I got the mean and critical difference (CD) value of each year's data but I want to represent the data as mean data of both the years. Should I have to perform new statistics on the mean values of both year's data and then show the CD value or I can take the average of CD values (from individual year's data)?

If I would have to perform new statistics on the mean values of both year's data should I have to take the average values of the individual year's data or the replication data of both years?

For example,

I have CD value of 1st year data as CD1 and 2nd year data as CD2. Mean value of 1st year data as M1 and 2nd year data as M2.

If I have to represent my data as average of both years such as M1+M2= M, can I show the CD value as CD1+CD2 = CD in the table or I have to perform the statistics again?

If I have to perform the statistics again then I have to consider M1 and M2 values or the replication values like R1,R2,R3 of year 1 data and R1,R2,R3 of year 2 data?

I will be very thankful to you.