Table 1 Features used in PD classifier, ranked by discriminative weight and scored with respect to the top-ranked feature: TimeBetweenRepeatQueries. Features are computed over all queries for each searcher. Features from the Motor class are first computed for each query instance and then averaged across all query instances for that searcher

From: Detecting neurodegenerative disorders from web search signals

Feature name	Class	Brief description	Weight
TimeBetweenRepeatQueries	Repetition	AVG time between repeat queries	1.000000
FractionOfQueriesAreRepeats	Repetition	% of all queries that are repeat queries	0.971182
NumberOfTremorEvents	Motor	# of tremor events^a	0.715004
AverageTremorFrequency	Motor	AVG tremor frequency in hertz (# of oscillations/time)	0.595772
FractionOfQueriesHaveSymptoms	Symptom	% of all queries with 1+ symptoms	0.457336
AgeIs50To85	Risk Factors	Inferred searcher age is 50–85 years	0.432355
FractionOfClicksAreRepeats	Repetition	% of result clicks that are repeat clicks on same result	0.341164
FractionOfQueriesHaveRiskFactors	Risk Factors	% of all queries with 1+ risk factors	0.329801
GenderIsFemale	Risk Factors	Inferred gender is female	0.313425
TotalTimeCursorMoving	Motor	Total time mouse cursor is actively moving	0.297699
NumberOfScrollEvents	Motor	# of scroll events	0.259432
NumberOfScrollEventsDownward	Motor	# of scroll events downward	0.256692
AverageScrolVelocity	Motor	AVG scrolling velocity	0.249454
MinimumCursorYCoordinate	Motor	MIN y-coordinate of mouse cursor (top of page y is 0)	0.247770
FractionOfCursorTransitionsAreDirectionChanges	Motor	% of mouse cursor transitions with direction changes^b	0.243873
AverageCursorAcceleration	Motor	AVG acceleration of mouse cursor	0.239814
NumberOfHyperlinkClicks	Motor	# of hyperlink clicks	0.239568
AverageCursorVelocity	Motor	AVG velocity of mouse cursor	0.232418
NumberOfCursorTransitionsAreDirectedUpward	Motor	# of transitions directed upward	0.232311
TotalDistanceScrolled	Motor	Total distance scrolled	0.215000
AverageCursorXCoordinate	Motor	AVG x-coordinate of mouse cursor (left of page x is 0)	0.214955
FractionCursorTimeInWhitespace	Motor	% of time mouse cursor in whitespace^c	0.211925
MaximumDeviationInPreclickCursorTrail	Motor	MAX deviation in pre-click mouse cursor trail^d	0.210185
AveragePreclickCursorVelocity	Motor	AVG velocity of mouse cursor before click	0.208572
TotalScrollingTime	Motor	Total time spent scrolling	0.207520
AverageCursorJounce	Motor	AVG jounce of mouse cursor	0.206460
MinimumCursorXCoordinate	Motor	MIN x-coordinate of mouse cursor	0.199193
MaximumCursorVelocity	Motor	MAX mouse cursor velocity	0.196639
NumberOfCursorTransitions	Motor	# of mouse cursor transitions between logged points	0.192631
GenderIsMale	Risk Factors	Inferred gender is male	0.191614
AverageCursorVelocity	Motor	AVG velocity of mouse cursor	0.190826
CursorExhibitsReadingBehavior	Motor	Cursor shows evidence of reading behavior²¹	0.190713
FractionCursorMoveTimeHaveTremors	Motor	% of mouse cursor move time having tremor events	0.188127
AverageCursorYCoordinate	Motor	AVG y-coordinate of mouse cursor	0.171520
AverageCursorJerk	Motor	AVG jerk of mouse cursor	0.168440
NumberOfTransitionsDirectedRightward	Motor	# of mouse cursor transitions directed rightward	0.157965
TotalNumberOfClicks	Motor	# of mouse clicks, inc. non-hyperlink (in whitespace)	0.153249
AverageAccelerationOfCursor	Motor	AVG acceleration of mouse cursor	0.150714
AgeIs35To49	Risk Factors	Inferred searcher age is 35–49 years	0.145166
NumberOfNonHyperlinkClicks	Motor	# of non-hyperlink mouse clicks	0.132365
MaximumCursorYCoordinate	Motor	MAX y-coordinate of mouse cursor	0.127897
NumberOfCursorEvents	Motor	# of mouse cursor events	0.126026
NumberOfScrollEventsUpward	Motor	# of upward scroll events	0.117682
TotalCursorDistanceTraveled	Motor	Total distance traveled by mouse cursor	0.111703
AverageCursorPreclickOverrunDistance	Risk Factors	AVG pre-click mouse cursor link overrun distance^e	0.110122
AverageCursorPreclickDeviation	Motor	AVG deviation in pre-click mouse cursor trail	0.106043
NumberOfCursorTransitionsDownward	Motor	# of mouse cursor transitions directed downward	0.104645
MaximumCursorJerk	Motor	MAX jerk of mouse cursor	0.098519
NumberOfCursorLoops	Motor	# of 360° loops in mouse cursor movements^f	0.094700
FractionOfTimeWithCursorInWhitespace	Motor	% of time spent with mouse cursor in whitespace	0.092794
MaximumCursorYCoordinate	Motor	MAX y-coordinate of mouse cursor	0.081183
NumberOfCursorTransitionsLeft	Motor	# of mouse cursor transitions directed left	0.074749
MaximumCursorJounce	Motor	MAX jounce of mouse cursor	0.072211
AgeIs25To34	Risk Factors	Inferred searcher age is 25–34 years	0.069420
NumberOfCursorDirectionChanges	Motor	# of mouse cursor direction changes	0.068290
FractionQueriesWithRepeatQueryClick	Repetition	% of queries with repeat query-result click pair	0.045272
MaximumCursorPreclickVelocity	Motor	MAX velocity of pre-click mouse cursor trail	0.035155

^a Tremor events are defined as horizontal or vertical oscillations in the position of the mouse cursor, with a mouse cursor movement of no more than 20 pixels in either direction
^b Transitions between logged cursor position data points where a change in mouse cursor direction is noted (e.g., moving the mouse cursor leftward then moving the mouse cursor rightward)
^c Fraction of total time spent on the search engine result page where the mouse cursor is parked over whitespace (i.e. regions of the result page where there are no elements)
^d Average residuals in a line of best fit for the five cursor position data points (i.e. the cursor trail) logged before a hyperlink click
^e Total distance traveled (in pixels) by mouse cursor pre-click after initial pass over the target hyperlink
^f Number of 360-degree loops in the mouse cursor trails, where a loop is defined as a sequence of direction changes resulting in a circular motion of the mouse cursor (e.g., move right, move down, move left, move up)

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