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Explore the World of Soft…e: Engineering & Science
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Explore_the_World_of_Software_Engineering_and_Science_HRS_Software_1998.iso
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programs
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statistc
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sims35.exe
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INSTALL._D2
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STATITEM.SCR
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1995-07-11
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ON ESC GOTO FINISH;
SET COLOR BLACK ON CYAN;
IF $MONO SET COLOR BLACK ON LIGHTGRAY;
CLS;
BOX
SIMSTAT v3.5 currently provides several tools
useful for scale development and testing such as
inter-rater agreement analysis, scale reliability
and sensitivity (ROC curves) analysis.
STATITEM v1.0 add the capability to perform
conventional item analysis for multiple-choice
item questionnaires.
ENDBOX;
BOX
Lets look at some statistics
provided by this module.
ENDBOX;
ECHO
ITEM ANALYSIS
Point-Bis Alpha if 25 pct
Value Freq Percent Biserial Correl Delete Hi-Low
V1 1.0 259 65% .43 .34 .674 62%
V2 4.0 317 79% .34 .24 .686 40%
V3 2.0 274 69% .63 .48 .653 72%
V4 3.0 378 95% .86 .42 .673 22%
V5 1.0 364 91% .47 .27 .683 24%
V6 4.0 389 97% .12 .05 .697 4%
V7 2.0 280 70% .51 .38 .668 60%
V8 2.0 374 94% -.03 -.02 .704 9%
V9 4.0 340 85% .31 .21 .689 28%
V10 2.0 340 85% .50 .33 .676 36%
V11 1.0 226 57% .45 .36 .672 70%
V12 3.0 388 97% .59 .23 .687 9%
V13 4.0 371 93% .46 .24 .685 20%
V14 2.0 346 87% .44 .28 .681 34%
V15 4.0 373 93% .52 .27 .683 19%
V16 1.0 379 95% .67 .32 .680 18%
V17 2.0 192 48% .39 .31 .679 73%
ENDECHO;
BOX ROW 3 COL 36
You can obtain for each item
in the scale the frequency and
percentage of correct responses,
ENDBOX;
BOX ROW 3 COL 56
the biserial and
point-biserial
correlation between
an item and the
total score omitting
this item,
ENDBOX;
BOX ROW 3 COL 20
the value the Cronbach's alpha
would take if the item was
deleted from the scale,
ENDBOX;
BOX ROW 3 COL 34
as well as a discrimination
index obtained by computing
the difference between the
percentage of correct
responses of the highest
and lowest groups.
(representing between 10%
and 50% of the cases)
ENDBOX;
ECHO
ITEM ANALYSIS
Point-Bis Alpha if 25 pct
Value Freq Percent Biserial Correl Delete Hi-Low
V1 1.0 * 259 65% .43 .34 .674 62%
2.0 10 3% -.62 -.23
3.0 17 4% -.15 -.07
4.0 114 29% -.33 -.25
V2 1.0 63 16% -.18 -.12
2.0 17 4% -.41 -.18
3.0 3 1% -.78 -.19
4.0 * 317 79% .34 .24 .686 40%
V3 1.0 15 4% -.52 -.22
2.0 * 274 69% .63 .48 .653 72%
3.0 22 6% -.58 -.28
4.0 89 22% -.39 -.28
V4 1.0 14 4% -.78 -.33
2.0 3 1% -.61 -.15
3.0 * 378 95% .86 .42 .673 22%
ENDECHO;
BOX
You may also obtain more detailed information about
the endorsement rate for each response to an item
along with its correlation with the scale total.
ENDBOX;
ECHO
ITEM-TOTAL RESPONSE RATE
SCORE 6 7 8 9 10 11 12 13 14 15 16
FREQUENCY 2 1 6 4 15 20 28 41 47 54 61
V1 50% 0% 33% 50% 20% 25% 39% 34% 45% 72% 80%
V2 0% 100% 50% 25% 53% 55% 54% 76% 77% 78% 85%
V3 0% 0% 0% 0% 20% 15% 29% 51% 62% 74% 85%
V4 50% 0% 17% 25% 53% 95% 86% 100% 100% 100% 100%
V5 0% 0% 83% 50% 60% 75% 86% 85% 96% 93% 97%
V6 100% 0% 83% 100% 93% 100% 100% 98% 96% 96% 95%
V7 0% 0% 0% 75% 27% 35% 32% 51% 55% 76% 90%
V8 100% 100% 100% 100% 100% 95% 79% 88% 96% 91% 90%
V9 0% 0% 67% 25% 80% 60% 79% 76% 83% 83% 95%
V10 0% 0% 33% 50% 40% 60% 79% 76% 81% 98% 92%
V11 50% 0% 33% 25% 13% 25% 25% 27% 32% 54% 66%
V12 50% 100% 33% 100% 93% 90% 93% 100% 98% 100% 100%
V13 50% 100% 50% 100% 73% 75% 82% 90% 89% 98% 98%
V14 0% 100% 50% 25% 60% 75% 68% 76% 89% 89% 92%
V15 50% 100% 50% 25% 67% 85% 93% 90% 96% 94% 98%
V16 50% 0% 50% 50% 73% 80% 93% 95% 98% 98% 100%
ENDECHO;
BOX
The item-total response rate table provides
detailed information about the percentage of
correct responses for each item in relation
to each value of the total score.
ENDBOX;
ECHO
ITEM CHARACTERISTIC CURVES (Smoothed)
V1 V2 V3
100│ ▄ 100│ ▄ ▀ 100│ ▄ ▀
│ ▀ │ ▄ ▀ │ ▄
│ ▀ │ ▄ ▀ │ ▀
│ ▀ │ ▄ │ ▄
50│............▄....... 50│......▄▀............ 50│..........▄.........
│ ▄ │ ▀ ▀▀ │
│▀▄ ▄ ▄ ▀ │▄ │ ▀
│ ▀ ▀ │ │ ▀
│ │ │ ▄ ▀
0│ 0│ 0│▄▄ ▀
└──────────────────── └──────────────────── └────────────────────
6 18 6 18 6 18
V4 V5 V6
100│ ▄▀ ▀ ▀▀ ▀ 100│ ▄▄ ▀▀ ▀ 100│ ▄ ▀▀ ▀▀ ▀▀ ▀▀ ▀
│ ▀ │ ▄▀ │▄ ▀
│ │ ▀ │ ▄
│ ▀ │ ▄▄ ▀ │
50│....▄............... 50│.▄.................. 50│....................
│ │ │
ENDECHO;
BOX ROW 17 COL 1
The same information
may also be displayed
graphically using
item-response
characteristic curves.
ENDBOX;
BOX ROW 15 COL 1
These curves allow you to
examine the relationship
between the total score and
the success level on an item,
compare the difficulty level
of several items and estimate
their discriminatory value.
ENDBOX;
ECHO
│▄ │▄ │
│ ▄ ▀ │ │
│ │ │
0│ 0│ 0│
└──────────────────── └──────────────────── └────────────────────
6 18 6 18 6 18
ITEM-TOTAL RESPONSE BREAKDOWN (25% of respondents in each group)
C25 C50 C75 C100 HI-LOW
V1 32% 53% 80% 94% 62%
V2 57% 77% 86% 97% 40%
V3 26% 64% 85% 98% 72%
V4 78% 100% 100% 100% 22%
V5 75% 93% 96% 99% 24%
V6 96% 96% 96% 100% 4%
V7 35% 62% 87% 95% 60%
V8 90% 93% 92% 99% 9%
V9 69% 82% 92% 97% 28%
V10 62% 86% 94% 98% 36%
V11 24% 39% 68% 95% 70%
V12 90% 99% 100% 99% 9%
V13 80% 93% 99% 100% 20%
V14 66% 87% 93% 100% 34%
V15 81% 94% 98% 100% 19%
V16 82% 98% 100% 100% 18%
V17 19% 31% 50% 92% 73%
V18 57% 73% 88% 96% 39%
ENDECHO;
BOX
STATITEM v1.0 can also produce an item-total response
breakdown where the percentage of correct responses is
presented by subgroups defined on their total score.
ENDBOX;
BOX
An option let you set the number of subgroups
between 2 and 10. For example, setting this
option to 4 will creates four groups, each
containing 25% of the respondents.
ENDBOX;
BOX COL 45 ROW 3
A discrimination index is also
computed for each item by
computing the difference in the
percentage of endorsement
between the groups with the
highest and the lowest scores.
ENDBOX;
ECHO
SCALE STATISTICS
Total score Percentage Biserial Item-Total
Mean 14.76 82.0 .45 .28
Median 15.00 85.8 .45 .28
Minimum 6.00 48.0 -.03 -.02
Maximum 18.00 97.3 .86 .48
Variance 6.62 206.7 .04 .01
Std. Dev. 2.57 14.4 .19 .12
Skewness -.745
S.E. Skewness .122
Kurtosis .104
S.E. Kurtosis .245
Nb of cases 400
Nb of items 18
Cronbach's Alpha .694
Ferguson's Delta .928
ENDECHO;
BOX COL 34 ROW 5
STATITEM v1.0 also provides numerous
descriptive statistics on the
distribution of the final scores
such as the mean, the median, the
minimum and maximum values, the
variance and the standard deviation.
ENDBOX;
BOX COL 32 ROW 13
The shape of this distribution
can also be assessed using
the skewness, the kurtosis,
and their standard error.
ENDBOX;
BOX COL 36 ROW 14
Descriptive statistics
are also provided for
percentages of correct
responses, point-biserial
and biserial correlations.
ENDBOX;
BOX COL 33 ROW 18
STATITEM v1.0 also compute the
Cronbach's alpha and the Ferguson's
Delta discrimination index for the
entire scale.
ENDBOX;
ECHO
TOTAL SCORE FREQUENCY DISTRIBUTION
Cumul Cumul
Value Frequency Percent Frequency Percent
6 2 .5 2 .5 │▌
7 1 .3 3 .8 │▌
8 6 1.5 9 2.3 │█▌
9 4 1.0 13 3.3 │█
10 15 3.8 28 7.0 │███▌
11 20 5.0 48 12.0 │█████
12 28 7.0 76 19.0 │███████
13 41 10.3 117 29.3 │██████████▌
14 47 11.8 164 41.0 │███████████▌
15 54 13.5 218 54.5 │█████████████▌
16 61 15.3 279 69.8 │███████████████▌
17 60 15.0 339 84.8 │███████████████
18 61 15.3 400 100.0 │███████████████▌
-------- -------- -------- -------- └─────────────────────────
TOTAL 400 100.0 400 100.0 0 100
ENDECHO;
BOX
A frequency table and a histogram
of the final score distribution
can also be displayed, providing
another perspective on those scores.
ENDBOX;
CLS;
BOX
STATITEM v1.0 is fully integrated with SIMSTAT. The program
is accessible from the Addins menu and supports current case
selection and weighting. STATITEM v1.0 is also easy to use
with a option panel and a context sensitive help.
ENDBOX;
BOX
Item analysis can also be automated using SIMSTAT's
command language. For example, the following
command:
ITEM Q1 TO Q30
/ISTAT HILOW=10 ITCURVE BREAKDOWN=5 TSTAT FREQ;
will perform an item analysis on all questions from
Q1 to Q30 displaying an item-total endorsement rates
and correlations table. The discrimination index in
this table will be computed using two groups, each one
representing 10% of the respondents. An item
characteristic curve will then be displayed as well as
an item-total endorsement breakdown for 5 groups, each
containing 20% of the respondents. Various statistics
and a frequency table of the final score will also be
displayed.
ENDBOX;
BOX
The RECORD SCRIPT function can also be used
to easily generate the proper commands
corresponding to actions undertaken with
the interactive user's interface.
ENDBOX;
BOX
STATITEM v1.0 is scheduled to be relesed in May '95
and will be available to registered users of SIMSTAT
for $35.00 only (plus $5 for shipping and handling if
ordered separately).
(see ORDER.FRM for ordering information)
ENDBOX;
:FINISH;
