NIfty 50 constituted in Nov 1995,But charts from July 1990 -How?

https://www.niftyindices.com/docs/default-source/indices/nifty-50/25-years-journey-of-nifty-50_2022-01.pdf

Above Pdf says NIfty 50 was constituted in Nov 1995,But charts are available from July 1990. How could it be possible? Request experts to throw light.

You’re right. But since data was available, the index is depicted from 1990.

“When a stock market index is created, it often undergoes a period of several years before it starts trading. This delay is primarily due to the need for establishing criteria for stock selection and ensuring that the index accurately reflects market performance. During this time, the index is calculated and adjusted to represent the intended stocks effectively, allowing for methodological refinement and ensuring compliance with market standards. Additionally, regulatory approvals and market readiness play crucial roles in this initial phase before trading can commence.”

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@NewUser123 Thanks…

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