Frequencies for first 10,000 rows of battyp_t variable in vindecode dataset : the description of | the polk assigned | code for the battery | type code. for | example | Freq. Percent Cum. ---------------------+----------------------------------- | 9,309 93.09 93.09 Lithium Ion | 16 0.16 93.25 Lithium-ion Polymer | 2 0.02 93.27 Nickle Metal Hydride | 104 1.04 94.31 Not Applicable | 569 5.69 100.00 ---------------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016