Slow Reaction On Cell Changes

Prevent Worksheet Change Event Causing Chain Reaction

Jan 14, 2008

I'd like the users to be able to change some detail in a couple of places and have it updated throughout the spreadsheet. Basically, the user can change the line name in any of the input sheets and the code changes the sheet name, and searches for the reference to the old name in the overview sheet and changes it accordingly.

The problem I have at the moment is that I would also like the user to be able to change the line name from the overview sheet too... I am having trouble thinking how to have similar code in the "Overview" sheets Worksheet_Change event without getting into a big constant loop... e.g. if the line name is changed via code on the individual input sheets won't that then trigger the first code, which will trigger the second etc. etc. I have the following code in the ThisWorkbook section:

Private Sub Workbook_SheetChange(ByVal Sh As Object, ByVal Target As Range)
Dim sName As String
Dim sOldName As String
Application. ScreenUpdating = False
sOldName = ActiveSheet.Name
If Target.Address <> "$B$1" Then Exit Sub
sName = ActiveSheet.Range("B1")
On Error Goto ErrorHandler
ActiveSheet.Name = sName
On Error Goto 0
Sheet8.Select 'this is the overview sheet
Cells. Find(What:=sOldName, LookIn:=xlValues, _
LookAt:=xlPart, SearchOrder:=xlByRows, SearchDirection:=xlNext, _
MatchCase:=False, SearchFormat:=False).Activate........................

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Macros To Clean, Summarize, And Merge Reaction Time Data Files

Jan 6, 2009

I need to use to prepare for analysis a large set of individual participants' Excel data files collected using a psychological reaction-time experiment (a modified Stroop task). This experiment was created using a program called Superlab by Cedrus, so I posted an inquiry at the Superlab forum [url]. Their tech support suggested I might need to use macros in Excel but couldn't offer further assistance. I'll try to briefly describe (a) our Stroop task, (b) the operations I'm trying to carry out, and (c) the format of the individual Excel files,

Our Stroop task: The participant gets some instructions and practice trials, then a series of stimulus words are presented one word at a time in the center of a computer monitor in one of several colors. Word presentation order is randomized for each participant. The participant must press a key corresponding to the color of each word as quickly as possible. For each keypress (including the spacebar, pressed on instructions screens), the reaction time (in msec) is recorded in their Excel spreadsheet under the 'Reaction Time' variable. The 'Error Code' variable indicates whether the participant pressed the correct (C) or incorrect (E) color key in each trial. There are 8 types of words for a total of 48 trials. (Actually, 4 sets of emotion words and 4 sets of control-animal words, each set composed of 6 words each. The task basically measures how much peoples� attention is captured by emotionally relevant cues in the environment.)

For each participant's data, I need an efficient way (macros?) to:
(1) clean it [i.e. discard or ignore the instruction & practice trials as well as trials where the participant was too impulsive (reaction time < 100 msec), too distracted (rt > 3000 msec), or gave the wrong color response (Error Code= E)]
(2) determine whether enough valid trials remain for further analysis (>39 trials), and if so:
(3) calculate a mean reaction time score for each of the 8 word types [where denominator for each word type is based on # remaining (non-discarded) trials for that word type]
(4) merge each participant's summarized data as single rows in a common spreadsheet (for importation and further analyses in SPSS), like this:
---------------------------
ID#...... MeanRTW1.......MeanRTW2...... (etc. for word types 3-8)
101.......1056................2013...............
102.......2148................2594...............
103...
---------------------------

Excel File Format: I've attached a sample file, and here's a simplified overview of a spreadsheet (irrelevant columns and some rows removed). First the ID number is recorded (e.g., 393E), then some unnecessary junk (exp name & date, intro, practice, instructions), then data for the 48 actual trials of interest:
-------------------------------------------
........A...............B..................C.................D............
1 393E
2 stroop.xpt
3 Wed Jan 1, 12:33:00 2008
4
5
6 Trial Name.....Trial No..... Error Code.....ReactionTime
7 introduction..... 1................C............561243
8 practice.......... 2................C............... 2062
9 red-worried........14.............C................1001 (*the first practice trial)
10 (9 more practice trial rows, deleted here)
19 instructions........3..............C................5000
20 red-chicken......19..............E............... 1205
21 blue-tense.......32...............C.................782
* (46 more actual trial rows, deleted here)
--------------------------------------------------

To clarify:
-The variable 'Trial Name' indicates nominally what stimulus was presented for each trial.
-The variable 'Trial No.', indicates the unique numerical marker for each stimulus word. (It probably should have been labeled 'Word Type'. It doesn't reflect the order of stimulus presentation. E.g., the word "tense" is always 'Trial No.' 32 for all participants, regardless of when it presents.)
-A subset of actual trial words (e.g., worried) were also used for the 10 practice trials. Thus, the 10 practice trials must first somehow be discarded or flagged to be ignored before calculating average reaction times for the remaining 48 actual trials.

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Sumproduct Too Slow, Delete Seconds From Every Cell

Jun 10, 2008

I have 2 problems:

1) I am doing multiple sumproducts on 6 sheets within a workbook with last row now being in the 12,000 cell range. Since putting in this SumProduct, my excel is extremley slow and affecting other windows applications. Is there anything I can use to replace this sum product ?

=SUMPRODUCT(--(TEXT($B$4:$B$9003,"mmddyyhh")=TEXT(P2273,"mmddyyhh")),$D$4:$D$9003)

It seems to be starting the calculations even before I put any values in column D ? I have already tried the manual calculation, but it is not making much of a difference.

2) After doing the sumproduct, I then need another row to look at the value of the sumproduct cell and report it in another sheet. My problem is that the cell contains the date and time in 1 cell, but in order to get the cell to lookup the value properly I need to delete the 00 in the seconds to refresh the cell or else it gives me back an n/a# value, even though the seconds are 00 and not 01 or 02 etc ?

example : ....