In search of magnetic anomalies associated with haunt-type experiences: pulses and patterns in dual time-synchronized measurements

(3.) The use of parametric statistics on these data might, at first, appear problematic. This is mainly because magnetic-field data are known to be inherently non-stationary and thus seriously violate important assumptions about using such procedures. There are a number of ways around this problem. One way is to use nonparametric procedures that do not make such normality assumptions. The other way is to correct for the nonstationarity by either a subtracting process or averaging the raw measurements into discrete mean averages. These mean values are normally distributed around a central mean value (known as the sampling distribution of the mean). Here, we adopted the second option and corrected the data by calculating a series of means. The ANOVAs were carried out on these corrected values.

(4.) We note that there is a slight increase in variability after the pulse event occurs. This is consistent with some device/settings switching on and placing a higher demand on the power supply.

(5.) Note that such patterns would be completely missed by most commercially available magnetometers employing much slower sampling periods than those used here.

TABLE 1
DESCRIPTIVE STATISTICS FOR BOTH SENSOR A (PILLOw AREA) AND SENSOR B
(BASELINE AREA) AVERAGED ACROSS ALL SESSIONS, WITH ALL VALUES GIVEN
IN NANOTESLA (NT)

           Sensor A (pillow area)  Sensor B (baseline)

                    Std                     Std
           Mean     Dev    Range   Mean     Dev    Range

Mag X      00076   00065   00417   00033   00034   00213
Mag Y      00052   00031   00206   00017   00009   00060
Mag Z      00022   00017   00103   00020   00009   00062
MagTotal   00116   00033   00195   00052   00021   00131

TABLE 2
DESCRIPTIVE STATISTICS FOR PULSE AMPLITUDE MEASURED
ACROSS BOTH SENSOR LOCATIONS, AMPLITUDE SHOWN IN
NANO TESLA (nT), VALUES SHOWN AS OVERALL. CHANGES
ABOVE THE BACKGROUND VARIABILITY (PEAK-TO-PEAK) AND AS
INCREASES AND DECREASES (+/-)

Pulse #   Session #   Amplitude (pillow area) Amplitude (baseline)
                      Overall       + / -     Overall     + / -

   1          1        216  nT     108 nT      122 nT     61 nT
   2          2        250  nT     125 nT      100 nT     50 nT
   3          2        222  nT     111 nT      92  nT     46 nT
   4          3        228  nT     114 nT      108 nT     54 nT
   5          4        234  nT     117 nT      88 nT      44 nT
   6          5        244  nT     122 nT      156 nT     78 nT
   7          6        259  nT     129 nT      110 nT     55 nT
Average       --       236  nT     118 nT      111 nT     55 nT

Note. The intensity of the pulses was greater (more than double)
in the pillow area than in the baseline area.

TABLE 3
DESCRIPTIVE STATISTICS FOR PULSE DURATION, MEASURED
ACROSS BOTH SENSOR LOCATIONS, DURATION GIVEN IN MILLISECONDS (MS)
ROUNDED-UP TO THE NEAREST 100 MS

Pulse      Session    Duration (pillow    Duration (baseline)
Number     Number     area)

   1          1            500 ms               300 ms
   2          2            400 ms               400 ms
   3          2            400 ms               400 ms
   4          3            400 ms               200 ms
   5          4            500 ms               300 ms
   6          5            500 ms               700 ms
   7          6            300 ms               500 ms
Average      --            500 ms               400 ms

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