縦断 じゅうだん てき研究 けんきゅうじゃなかったです
jūdanteki kenkyūjanakattadesu

Noun
Desu Copula

The polite, past negative form of 縦断的研究

1. Was not a longitudinal study.; Wasn't a cross-sectional study.

Past/Perfective
Negative
Polite
Casual Register