# Secondary aggregation periods and using built-in functions against them

##### New member
Having some difficulty getting the following to work, hope someone with extensive experience with thinkscript can elaborate what I am doing wrong.

Chart on custom timeframe (65mins)

Code:
``````input NumDayslength = 30;
input ShowPercentOfDayAvg = yes;
input UnusualVolumePercent = 200;

def agg = if GetAggregationPeriod() == 3900000 then AggregationPeriod.HOUR else GetAggregationPeriod();

def VolDayAvg = Average(volume(period = agg)[1], NumDayslength);
def Vol = volume(period = agg);
def rVol = Vol / VolDayAvg;
def PercentOfDayAvg = Round((rVol * 100), 0);``````

Out come is "Secondary period cannot be less than primary"
So I am thinking I bet the built-in function "Average" needs to have the secondary aggregate specified to it. But first to rule that out:

Code:
``````input NumDayslength = 30;
input ShowPercentOfDayAvg = yes;
input UnusualVolumePercent = 200;

def agg = if GetAggregationPeriod() == 3900000 then AggregationPeriod.HOUR else GetAggregationPeriod();

def VolDayAvg = volume(period = agg)[1];
def Vol = volume(period = agg);
def rVol = Vol / VolDayAvg;
def PercentOfDayAvg = Round((rVol * 100), 0);``````

Out come is the same "Secondary period cannot be less than primary".

Code:
``````input NumDayslength = 30;
input ShowPercentOfDayAvg = yes;
input UnusualVolumePercent = 200;

def VolDayAvg = volume(period = AggregationPeriod.HOUR)[1];
def Vol = volume(period = agg);
def rVol = Vol / VolDayAvg;
def PercentOfDayAvg = Round((rVol * 100), 0);``````

Out come same as well "Secondary period cannot be less than primary"?

I dont understand why?

Solution
"Secondary period cannot be less than primary" means that you cannot use data in minutes on a 10 minute chart, nor hours on a day chart. You can use 10 min aggregation on a 1 min chart, or days on an hour chart however. It is a limitation of ToS. There are several answers to this question floating about.

-mashume
"Secondary period cannot be less than primary" means that you cannot use data in minutes on a 10 minute chart, nor hours on a day chart. You can use 10 min aggregation on a 1 min chart, or days on an hour chart however. It is a limitation of ToS. There are several answers to this question floating about.

-mashume

87k+ Posts
199 Online

## The Market Trading Game Changer

Join 2,500+ subscribers inside the useThinkScript VIP Membership Club
• Exclusive indicators
• Proven strategies & setups
• Private Discord community
• Exclusive members-only content
• 1 full year of unlimited support

What is useThinkScript?

useThinkScript is the #1 community of stock market investors using indicators and other tools to power their trading strategies. Traders of all skill levels use our forums to learn about scripting and indicators, help each other, and discover new ways to gain an edge in the markets.

How do I get started?

We get it. Our forum can be intimidating, if not overwhelming. With thousands of topics, tens of thousands of posts, our community has created an incredibly deep knowledge base for stock traders. No one can ever exhaust every resource provided on our site.

If you are new, or just looking for guidance, here are some helpful links to get you started.

What are the benefits of VIP Membership?