## Collections with several samples from the same trunkMulti-radii collections

### How to name radii taken from the same trunk

 Note: You do not have to calculate mean value curves for each tree and then add these to a collection consisting of e.g. only mean values. You can as well add all your radii directly to a collection. To let CDendro know which radius comes from which tree, you should carefully select the identities of your samples. Five samples from 2 different trees could be named NM01A, NM01B, NM02A, NM02B1, NM02B2. The identity for a tree should end with a digit. An optional following letter indicates a radius. One radius may be divided into two samples if they are named e.g. NM02B1 and NM02B2.) Please note, when you calculate the mean value from this collection the checkbox "Sum by stem" should be checked! Then an "X-column" is shown to the right of the sample identities. When there is an X in that column it means that CDendro "understands" that this sample refers to the same tree as that on the previous row when the rows are sorted by MemberID. (For sorting: Click on any column header repeatedly to sort by the content of that column in ascending or descending order.)

### How to plot several radii in parallel

To see a plot of all radii from only one stem:
Use the "Uncheck all" button
Check the members of the stem of interest
Click the button "Plot all members"
A plot showing 4 radii taken from the same stem
Vertical lines
When you move the cursor over the curve diagram a vertical line follows your cursor symbol.
When you click on the diagram a vertical line is left at that place as shown on the picture above.
If you click again at a line, then it will be removed.
Actual year number - as dated - is shown at the top of the line.

### Sum by stem and Test towards rest of collection

When you run a "Test towards rest of collection" command on a collection which contains members
where some of them originate from the same trunk,
you should see that "Sum by stem" is really checked (it is so by default).

When "Sum by stem" is checked a certain radius is tested towards the rest of the collection excluding other radii from that same stem.

The tables above show the difference created from running "Test towards rest of collection" with and without checking "Sum by stem".
When other radii from the same trunk are added to the collection before comparison, then matching gives much higher values.

Note: When you have only radii from one stem checked in a collection then you HAVE TO uncheck the "Sum by stem" box to get your result.
Otherwise you'll get the error message shown above.