Transforming Library Navigation and Collection Access with StackMap

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David Hayden

Is it possible to get the Mean and Standard Deviation values you used across the key metrics for the LJ 2022 star ratings of libraries in the $10M-$29.9M with a LSA of 100k-250k? If I use the posted data for star libraries reported, using your formulas, I don't get anywhere near the same scores. I assume it is because I am using a small sample of 13 libraries to calculate the Mean and StdDev.

For example if I calculate the Mean & StdDev for the libraries in the $10M-$29.9M category with a LSA of 100k-250k (13 libraries) and use that for the calculations
(((Lib data -Peer Pop Mean) / Peer Pop StdDev) +8) *100 I get a Score of 1,551 for Naperville instead of the 2,669 in the report. I do sum the scores for each category before I add the 8 as shown below

Naperville Public Library

Physical Circulation 22.52
Minus Physical Circulation Mean 11.73
= 10.79
Divided by Physical Circulation StdDev 6.98
score for circulation = 1.551

Circ Score 1.55 Em Score -0.05 Visit Score 2.71 Prog Attnd Score 1.09 Comp Use Score 1.82 Wi Fi Session Score 0.39 ER Score Raw 2.14 Score Sum 7.51 + 8 = 15.51 x100 = 1551


And so on for each key category. The results for each category are added up, 8 is added and that sum multiplied by 10 as per your 7 Step "Score Calculation Algorithm"

Posted : 2023-06-21 18:15:32


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