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Dear all, i just wonder if there´s a way to use a two column time index field in plm package. the manual says the following concerning data indexing: a character vector of length two containing the names of the individual and the time index, What would y´all do with a quarterly dataset that contains one column for the period and one for the year. Do I have to convert it to one single date

...` 5d90: 86 50 58 53 58 0a 02 14 0f 5f 50 52 57 00 a4 47 .PXSX...._PRW..G 5da0: 50 52 57 0a 09 0a 04 14 16 5f 50 52 54 00 a0 0a PRW......_PRT... 5db0: 50 49 43 4d a4 41 52 30 39 a4 50 52 30 39 5b 82 PICM.AR09.PR09[. 5dc0: 45 0e 52 50 30 37 08 5f 41 44 52 0c 06 00 1c 00 E.RP07._ADR..... 5dd0: 5b 80 50 58 43 53 02 0a 40 0a c0 5b 81 4a 05 50 [.PXCS.. at ..[.J.P 5de0: 58 43 53 00 00 40 08 4c 30 53 45 01 00 07 00 08 XCS.. at .L0SE..... 5df0: 00 0d 4c 41 53 58 01 00 32 41 42 50 58 01 00 02 ..LASX..2ABPX... 5e00: 50 44 43 58 01 00 02 50 44 53 58 01 00 01 4c 53 PDCX...PDSX...LS 5e...