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(Abridged) I present a comprehensive and uniform analysis of 25 {\it ASCA}observations from 23 Narrow-line Seyfert 1 galaxies. The time series analysisis presented in this paper, Part 1, and the spectral analysis and correlationsare presented in the companion paper, Part 2.

A Comprehensive Spectral and Variability Study of Narrow‐Line Seyfert 1 Galaxies Observed by ASCA . I. Observations and Time Series Analysis