Data Differences in Continuous Contract Charts

[hcour]

I'm new to futures so forgive the ignorance. Why are these wkly corn charts so different? The first chart, from MRCI, there are higher lows 01, 02, 03. The second chart, from Prophet.net, there are lower-lows during this period. I realize there are diff ways of calculating the data, back-adjusted, split, what-have-you, but this seems an extreme divergence.

http://www.streamload.com/hcour/CornMRCI.gif

http://www.streamload.com/hcour/CornPro.gif

Thanks,
Harold

 

[NUTSNEAL]

Looks like a monthly and a weekly chart comparison.

 

[Aaron]

Yes, the difference is due to the continuous contract adjustment. Prophet uses forward-adjusting to eliminate the gap when rolling forward to the new contract month. Forward adjusting means that recent prices look completely different than the true market prices (notice the negative prices on your chart).

Use the Prophet symbol C1600 (instead of C1700) to get the unadjusted Corn price history. This chart looks a lot more like your other chart.

 

[hcour]

Aaron,

>> Use the Prophet symbol C1600 <<

Ok, thanks, the 1600 chart looks much more consistent w/others. Thanks for the explanation.

Harold