Knowledge Base

Nesting Over Mobility State

Aim

To pick out data collected when the subject was in one of the Mobility states: Immobile, Mobile or Highly Mobile.

Example: Calculate the average velocity for when the subject was in the state Highly mobile.

Nesting vs. Nesting Over Subjects

Notice the difference when there are multiple subjects in the same arena:

• To select data of a subject based on the Mobility state of that subject, choose Mobility state under Nesting. See the procedure below.
• To select data of a subject based on the Mobility state of other subjects, choose Mobility state under Nesting over subjects. There you find the Actors tab where you can specify which subjects (Actors) were in a certain Mobility state. See Nesting over subjects.

Procedure

1. In the Data Profile, under Nesting click the button next to Mobility state.
2. In the Mobility State window:
   • Under Outlier filter, enter an Averaging interval to smooth the Mobility values.
   • Under Threshold, enter the thresholds of the mobility variable that define the states Immobile, Mobile and Highly mobile.
   • Under Calculate nesting for, select the Mobility state that defines the intervals.
   For details about how Mobility state is calculated, see Dependent Variables in Detail > Mobility state.
3. Click OK. Proceed with step 4 in How to select track segments.

Notes

• For Mobility state, it is possible to select different thresholds when you define Mobility state in Nesting (see above) and in the Analysis profile (see Calculate statistics: procedure). You should either use the same thresholds or set the thresholds in your analysis profile more restrictive, so that the variable specified in the Analysis profile is in effect a fine-tuning of your nesting criteria.
• In some cases the number of samples available for smoothing can be less than the averaging interval entered. For example, in tracks with missing samples or at the beginning of the track. In such cases EthoVision XT uses the samples available in the specified interval. See Averaging interval.
• If you select Mobility state under Nesting over subjects, and you select two or more subjects in the Actors tab of the settings window, you have the following options:
  • To analyze the track segment when at least one of those subjects was in the selected Mobility state, choose Any selected subject.
  • To analyze the track segments when all the selected subjects were in the selected Mobility state simultaneously, choose All selected subjects.

See Also

• Nesting over Subjects

Nesting Over Proximity

Aim

To pick out data collected when one or more subjects (Actors) were within a user-defined distance from one or more other subjects (Receivers).

Example: Calculate the average mobility when the subject was in proximity of other subjects.

Nesting vs. Nesting Over Subjects

Notice the difference when there are multiple subjects in the same arena:

• To select data of a subject based on the Proximity behavior of that subject, choose Proximity under Nesting. In the Receivers tab you specify which subject was in proximity of the focal subject. See the procedure below.
• To select data of a subject based on the Proximity behavior of other subjects, choose Proximity under Nesting over Subjects. There you find the Actors tab and the Receivers tab where you can specify which subjects (Actors) were in proximity of which other subjects (Receivers). See Nesting over subjects.

Procedure

1. In the Data Profile, under Nesting click the button next to Proximity.
2. In the Proximity window, select the Proximity state that defines the intervals to analyze.
   • Enter the In proximity threshold and the Not in proximity threshold.
   • Under Calculate nesting for, choose which state defines the intervals.
   For details about how proximity is calculated, see Dependent Variables in Detail > Proximity.
3. Click the Body Points tab (when available), and specify the body points that define proximity. Choose whether proximity is based on all the chosen points being in proximity simultaneously (All selected points) or not (Any selected point).
4. Click OK. Proceed with step 4 in How to select track segments.

See Also

• Nesting over Subjects