Different opening prices 1min / 150tick

[insomniac]

I have been trying to figure this problem out for a while. I use two charts, the 1 minute chart and a 150tick chart. I have both set to begin the session at exactly 7:30am(mst), however more often than not, I end up with two different opening prices. I always sync my PC clock before market open also.

I can't understand why my opening price can be so far off between two charts. I have attached a picture of what I am referring to.



As you should be able to see, the opening price is off by 4 ticks/1point.

insomniac

[NinjaTrader_Ray]

What data feed?

[insomniac]

What data feed?

Zen-Fire

insomniac

[NinjaTrader_Ray]

Thank you.

The reason is that the historical data server you pull from 1 minute bars are aggregated from time stamps 00:01 to 00:00 where the NT 6.5 client is from 00:00 - 00:59. If you reload data some time throughout the day, the difference in how minute bars are aggregated would account for the difference.