Evolution of statistical techniques in Astronomy

The requirement for more robust statistical tools is becoming increasingly higher owing to the demands of various large programmes and the technological advancement producing high-sensitive observations across the electromagnetic spectrum. Among the many existing analyses, the ones working on the time-series as set by the monitoring projects using single-dish/optical telescopes and those of spectral-line observations as rendered by ALMA/IFUs are the subject of the discussion here. The presentation sheds light on various procedures and fallacies encountered in practice while providing insight into new techniques