Qlik Community

New to QlikView

Discussion board where members can get started with QlikView.

Announcements
Leverage your QlikView investment to modernize BI – see how! Join Group
cancel
Showing results for 
Search instead for 
Did you mean: 
Highlighted
Master II
Master II

Degrees of polynomial in charts

Hi All, When will you  use Polynomial 2nd 3rd or 4th degree in charts? Thanks in advance.

Tags (2)
6 Replies
Highlighted
Specialist
Specialist

Re: Degrees of polynomial in charts

Expression tab:

TrendlinesIn selected QlikView charts expression plots can be complemented or replaced by statistical trend lines. Trend lines can only be displayed in scatter charts, line charts and in bar/combo charts with maximally one dimension and one expression shown as bars. For other types of charts, the settings in the Trendlines group are unavailable and have no effect. In scatter charts the data points are treated as if y=f(x). For bar, line and combo charts it is allowed to deselect all options under Display Options and still add trend lines, which will then be plotted without the underlying data points. Trend lines in bar, line and combo charts may be extrapolated by specifying a forecastand/or backcast interval (Axes page). The extrapolated lines will be dotted. Trend lines in charts with a discrete x-axis will be shown as lines with symbols. On a continuous axis only the line will be shown.

Average
The average is plotted as a straight line.
Linear
A linear regression line is plotted.
Polynomial of 2nd degree
A polynomial trend line of the second degree is plotted.
Polynomial of 3rd degree
A polynomial trend line of the third degree is plotted.
Polynomial of 4th degree
A polynomial trend line of the fourth degree is plotted.
Exponential
An exponential trend line is plotted.
Show Equation
If this check box is marked for a specific expression, the expression’s trend lines will be complemented by the trendline equation expressed as text in the chart.
Show R2
If this check box is marked for a specific expression, the expression’s trend lines will be complemented by the coefficient of determination expressed as text in the chart.

Axis tab:

Backcast

This function operates on trend lines. Enter into the text edit box how far back you would like to estimate the trend line. See Chart Properties: Expressions. The backcast portion of trend lines is displayed as dotted.

Forecast

Enter into the text edit box how far you wish to predict the trend line. See Chart Properties: Expressions. The forecast portion of trend lines is displayed as dotted.

Highlighted

Re: Degrees of polynomial in charts

We use this option for Forecasting. Please find the below details taken from QlikView reeference manual

In selected QlikView charts expression plots can be complemented or replaced

by statistical trend lines. Trend lines can only be displayed in scatter charts,

line charts and in bar/combo charts with maximally one dimension and one

expression shown as bars. For other types of charts, the settings in the Trendlines

group are unavailable and have no effect. In scatter charts the data points

are treated as if y=f(x). For bar, line and combo charts it is allowed to deselect

all options under Display Options and still add trend lines, which will then be

plotted without the underlying data points. Trend lines in bar, line and combo

charts may be extrapolated by specifying a forecast and/or backcast interval

(Axes page). The extrapolated lines will be dotted. Trend lines in charts with a

discrete x-axis will be shown as lines with symbols. On a continuous axis

only the line will be shown.

Average

The average is plotted as a straight line.

Linear

A linear regression line is plotted.

Polynomial of 2nd degree

A polynomial trend line of the second degree is plotted.

Polynomial of 3rd degree

A polynomial trend line of the third degree is plotted.

Polynomial of 4th degree

A polynomial trend line of the fourth degree is plotted.

Exponential

An exponential trend line is plotted.

Show Equation

If this check box is marked for a specific expression, the expression’s trend

lines will be complemented by the trendline equation expressed as text in the

chart.

Show R2

If this check box is marked for a specific expression, the expression’s trend

lines will be complemented by the coefficient of determination expressed as

text in the chart.

Highlighted
Master II
Master II

Re: Degrees of polynomial in charts

Hi, Could you please give an example of qvw? Thank you.

Highlighted
MVP & Luminary
MVP & Luminary

Re: Degrees of polynomial in charts

Hi,

Check this link for some basic stuff with examples, then you can easily understand it in Qlikview. 

Degree (of an Expression)

Regards,

Jagan.

Highlighted
Master II
Master II

Re: Degrees of polynomial in charts

Hi Jagan, As a science student, I was worked on this in academics.Could you please provide an example where we use in Qlikview develpment? Thank you.

Highlighted
MVP & Luminary
MVP & Luminary

Re: Degrees of polynomial in charts

Hi,

In some statistical dashboards users request to add this polynomial, not sure how it really helps for them.  But in Qlikview charts it is straight forward, just need to select option in Trendlines section of Expression tab.

Hope this helps you.

Regards,

Jagan.