Don't confuse with 环比 huánbǐ ('quarter-on-quarter / month-on-month' — comparison with the immediately preceding period). 同比 = same period a year ago; 环比 = the period right before. Both appear in every Chinese economic report.
register
Statistics/economics term, ubiquitous in financial news. Almost always followed by 增长 'grow' or 下降 'fall' plus a percentage.
