[mister ed]

There are differences between MP and the 'Price Histogram' used instead by Ensign - would it be worthwhile discussing the differences here with a view to ascertaining how significant these differences are?

From the Ensign website:
"The histogram on the left side of the chart is drawn during the day in five-minute increments. The length of each horizontal line in the histogram represents the amount of time that the market spent at that corresponding price. "

So, instead of letters to signify each 5-minutes/half-hour (or whatever time increment being used) we have a horizontal line summing the TPOs (the link above will take you to an example of an Ensign Price Histogram chart).

How does this effect the use of MP?
Does it change the calculations for POC, VAH, VAL? (I think the answer to all 3 is no).
How else does it cause differences to MP?
Is it a better display than MP?

I am not deeply knowledgeable of MP, so I ask these questions of those who are more knowledgeable than me. This is not an academic exercise either, to me Ensign is a strong competitor to other charting packages, the information and knowledge we gain here will be useful to those considering Ensign as their charting package.

[Sparrow]

I suppose instead of printing TPO's with letters they are displaying either the volume or the
time(secs/minutes) price spent at a certain level.

There are options for Volume-based, and Candle-based. Typically the Time and Volume based profiles generate POC's that are almost exactly the same.

Ensign would have to pay royalties to CBOT if they implemented a TPO based MP, since market profile is copyrighted by CBOT.

[torero]

Yeah, I think Ensign is a poor man's program, not that it's a bad thing since it's an individual not a company that created this software. I totally dig that. So bare essentials with contributions from users like open source is an excellent source of enriching the software. Basically, this is to avoid paying out fees to the big bad bullies (exchanges).

[mister ed]

Originally Posted by torero »

Yeah, I think Ensign is a poor man's program,

Well, you know torero, I am not sure I agree. It is why I started this thread ... let's get some feedback from MP users, and Ensign PH (Price Histogram) users on what the differences are.

Let me admit some biases:
I don't use Ensign.*
I don't use MP (I am familiar with the basics of it).*

So, there is probably no-one less qualified on the board than me to start this thread , but I would like to hear the various points of view. With my limited knowledge of MP I am starting with the point of view that the differences between MP and EPH are minor and insignificant - but I am more than happy to be shown otherwise.

--------------------
* I don't use Ensign but I think it is a fantastic program with fantastic support that was only just edged out by I R/T for me.
* I don't use MP but I can appreciate the thought and effort that goes into using it by its practitioners, and I can see how it could add a lot of value to its users trading.

[mister ed]

Let me start with two specific questions for MP/EPH users.

Is the POC price derived from a MP going to be the same as a POC derived from an EPH? (I think the answer is obviously yes).

Are the VAH and VAL prices derived from a MP going to be the same as the VAH and VAL prices derived from an EPH? (This one I think is not so obvious, but I cannot see that the VAH and VAL prices derived from the two processes will vary with any significance).

Actually three questions - am I asking the wrong questions here?

[torero]

EPH is derived from 5-min, it's fixed while MP is from 30-min. POC from both are the same, it's the most traded price, assuming EPH is calculated from price and not volume. As for VAH and VAL, I'm not entirely sure just yet since I'm still new with MP and still trying to understand how's calculated, but EPH take the 2 standard deviation on each end.

[Anonymous]

There are at lest three ways to calculate Value Area and POC information. One is done using TPO or Touch at Price counts. The second is based on Volume at price counts. That is why you may see different MP numbers from different sources. Many, if not most, of the time the values are the same. But of course there can be differences. So even if you use tradestation and have the option of what to use, you could get different values as somebody else.

The Enthios price histogram is awesome. It's the Ensign version.

As far as which is better, I think that might be as subjective as which platform is better. And we know how divisive that can be.

[jperl]

Originally Posted by mister ed »

Let me start with two specific questions for MP/EPH users.

Is the POC price derived from a MP going to be the same as a POC derived from an EPH? (I think the answer is obviously yes).

Are the VAH and VAL prices derived from a MP going to be the same as the VAH and VAL prices derived from an EPH? (This one I think is not so obvious, but I cannot see that the VAH and VAL prices derived from the two processes will vary with any significance).

Actually three questions - am I asking the wrong questions here?

Perhaps this is the place for me to comment on this since I have written 11 threads on this topic entitled "Trading with Market Statistics".
You should be aware that market profile was developed more than 40 years ago at a time when plotting distribution functions had to be done by hand. You can understand that it was not possible to include every trade in the distribution function. Instead prices in 30 minute increments were used to generate the distribution. The net result is you end up with a distribution that essentially is a 30 minute average of the real distribution. Even Ensigns computation of the distribution is approximate, but it is much closer to the real distribution than anything else.
Using a distribution like Ensign's has many advantages, none the least of which the Peak Volume Price dynamic (which I call the PVP to distinguish it from Market Profile's POC) is easy to follow as it builds up at one price and then evolves into another price over time. In MP this tends to get washed out due to the averaging.

As far as value area is concerned, again for Market Profile, this was an historical choice of 70% of the data to conform to something like 1 standard deviation observed in a Normal Distribution. Unfortunately, the distribution is rarely Normal, so that defining a "value area" in this way is purely heuristic and has little if anything to do with the true standard deviation for the distribution. If anything, computing the value area with respect to the PVP yields values which are usually too large. A complete discussion of this can be found in the "Trading with Market Statistics" threads.