Create a table with deflated welfare means for each country and surveyid year.
db_create_dsm_table(lcu_table, cpi_table, ppp_table)
data.table: A table with newly estimated LCU survey means.
Output of db_create_lcu_table()
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data.table: A table with CPI data.
data.table: A table with PPP data.
data.table