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How to stop a chart trendline at the current date

I have a trend line that just keeps on going after the current date.  It would probably be OK if it were a straight line, but I've checked the Polynomial of 4th Degree checkbox in the Trend Line section on the Expressions tab of the chart's Properties dialog, so I can show how orders tend to rise and fall with the shopping seasons of the year.  On the same chart, I have a line each for a couple of past years, and they look great (Red line on chart, below.)  Unfortunately, for the current year, the line looks good up to the current date, then quickly drops off to zero for the rest of the current year, and makes it look like we're projecting zero orders and business is getting bad (Blue line on chart, below.)

Past Year good red line; Current Year bad blue line.Past Year good red line; Current Year bad blue line.







Here's my expression I use for the current year:

SUM ( IF( Fiscal_Year = YEAR( Now() ), Retail_Price, 0))

I thought if I put null() instead of zero as the ELSE it might solve the problem,

SUM ( IF( Fiscal_Year = YEAR( Now() ), Retail_Price, Null()))

But I see no difference between the two, on the chart.

Is there a way, in QlikView, to stop a curve/trend line from continuing after the current date?

Thanks in advance.

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2 Replies
Valued Contributor II

Re: How to stop a chart trendline at the current date


you cannot limit the appearance of the trendline.

What you can do is create your own expression for the trendline and limit that to your dataset.

Sample for Linear Trend:

if( DATE < date(today()),
	linest_m(total aggr(if(sum(Retail_Price) ,sum(Retail_Price)), YOUR_DIMENSION), YOUR_DIMENSION)
	* only(DATUM) + linest_b(total aggr(if(sum(Retail_Price) ,sum(Retail_Price)), YOUR_DIMENSION), YOUR_DIMENSION)


Digital Support
Digital Support

Re: How to stop a chart trendline at the current date

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You can always check the Design Blog area for posts there that may give you some further ideas too:


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