RangeCorrel() returns the correlation coefficient for two sets of data. The correlation coefficient is a measure of the relationship between the data sets.
Syntax:
RangeCorrel(x_value , y_value[, Expression])
Return data type: numeric
Data series should be entered as (x,y) pairs. For example, to evaluate two series of data, array 1 and array 2, where the array 1 = 2,6,9 and array 2 = 3,8,4 you would write RangeCorrel (2,3,6,8,9,4) which returns 0.269.
Arguments:
| Argument | Description |
|---|---|
| x-value, y-value | Each value represents a single value or a range of values as returned by an inter-record functions with a third optional parameter. Each value or range of values must correspond to an x-value or a range of y-values. |
| Expression | Optional expressions or fields containing the range of data to be measured. |
Limitations:
The function needs at least two pairs of coordinates to be calculated.
Text values, NULL values and missing values return NULL.
Examples and results:
| Examples | Results |
|---|---|
|
RangeCorrel (2,3,6,8,9,4,8,5) |
Returns 0.2492. This function can be loaded in the script or added into a visualization in the expression editor. |
Example:
Add the example script to your app and run it. Then add, at least, the fields listed in the results column to a sheet in your app to see the result.
RangeList:
Load * Inline [
ID1|x1|y1|x2|y2|x3|y3|x4|y4|x5|y5|x6|y6
01|46|60|70|13|78|20|45|65|78|12|78|22
02|65|56|22|79|12|56|45|24|32|78|55|15
03|77|68|34|91|24|68|57|36|44|90|67|27
04|57|36|44|90|67|27|57|68|47|90|80|94
] (delimiter is '|');
XY:
LOAD recno() as RangeID, * Inline [
X|Y
2|3
6|8
9|4
8|5
](delimiter is '|');
In a table with ID1 as a dimension and the measure: RangeCorrel(x1,y1,x2,y2,x3,y3,x4,y4,x5,y5,x6,y6)), the RangeCorrel() function finds the value of Correl over the range of six x,y pairs, for each of the ID1 values.
| ID1 | MyRangeCorrel |
|---|---|
| 01 | -0.9517 |
| 02 | -0.5209 |
| 03 | -0.5209 |
| 04 | -0.1599 |
Example:
XY:
LOAD recno() as RangeID, * Inline [
X|Y
2|3
6|8
9|4
8|5
](delimiter is '|');
In a table with RangeID as a dimension and the measure: RangeCorrel(Below(X,0,4,BelowY,0,4)), the RangeCorrel() function uses the results of the Below() functions, which because of the third argument (count) set to 4, produce a range of four x-y values from the loaded table XY.
| RangeID | MyRangeCorrel2 |
|---|---|
| 01 | 0.2492 |
| 02 | -0.9959 |
| 03 | -1.0000 |
| 04 | - |
The value for RangeID 01 is the same as manually entering RangeCorrel(2,3,6,8,9,4,8,5). For the other values of RangeID, the series produced by the Below() function are: (6,8,9,4,8,5), (9,4,8,5), and (8,5), the last of which produces a null result.