
HI,

I have the price and volume data from own product and competitor's product:

   Year_Month Volume     own product's price Volume                  competitor's price
1      201011  17583                        469.03       NA                              NA
2      201012  33899                        489.25       NA                              NA
3      201101  31306                        488.42       NA                              NA
4      201102  21272                        479.07      173                             550
5      201103  24145                        462.99     2684                             548
6      201104  20763                        433.87     4787                             475
7      201105  25337                        410.22     9805                             430
8      201106  21793                        422.52    14096                             388
9      201107  26081                        417.76    17452                             383
10     201108  21933                        420.86    22432                             373
11     201109  21560                        396.53    17678                             353
12     201110  28538                        360.49    17864                             349
13     201111  20995                        346.47    11857                             340
14     201112  42961                        353.49    35938                             332
15     201201  26378                        341.49    20544                             330
16     201202  21531                        350.82    16259                             339
17     201203  19386                        365.95    14361                             348
18     201204  20441                        347.06    12255                             357


because competitor's product was launched at 201102. so I am having missing data before that time for competitor's product and volume after I merge all data together.
my aim to set up the model based on the data. because I have so less data points. I don't want to delete those rows with NA records. but How should I handle this case?
I am thinking to use mean imputation. but is it suitable for this case?

Thank you so much for your reply.

Kind regards,
Tammy
 		 	   		  
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