URL for NWEA 2015 MAP score/percentile converter

Posted by: David448

URL for NWEA 2015 MAP score/percentile converter - 04/10/19 12:43 PM

We just received the Winter + Spring MAP 2-5 scores for our 2nd grader. The school's printout includes only the raw scores and lacks percentiles based on 2015 data. So, I researched the topic a bit and created an interactive calculator to convert scores to their 2015 national percentiles:

NWEA Score Percentile Calculator

It has built-in the 2015 tables for Begin, Mid, and End-Year for Math, Reading, and Language Usage as published here.
The conversion uses a standard z-Score computation via math.js's erf. Google analytics is enabled on the site.

The usual caveats apply (in Math, there's not one, but 3 tests (K-2, 2-5, and 6+), so scores shouldn't be compared except when the same test was taken), and of course this is an achievement test, not an IQ test, and there's apparently no research on how well gifted children do on the MAP test.

Still, I hope this may be useful to others, particularly if their school reports do not include percentiles, which is why I'm sharing it here. NWEA publishes the same data but in table form and without the interactive calculator/coloring part.
Posted by: Cranberry

Re: URL for NWEA 2015 MAP score/percentile converter - 05/14/19 04:37 PM

I really wish this had been available years ago - I've been doing it manually for both kids 3x/year for a long time. And now my youngest just wrapped up her final test.

I checked several data points and everything agrees with what I have.

Great tool - thanks for the contribution.
Posted by: David448

Re: URL for NWEA 2015 MAP score/percentile converter - 10/06/20 08:04 PM

I updated this to include the 2020 Normative Data.
Posted by: philly103

Re: URL for NWEA 2015 MAP score/percentile converter - 10/22/20 12:48 PM

Thanks for this!!! I first used it last year. I really appreciate your timely update as well!
Posted by: ameeeesmith

Re: URL for NWEA 2015 MAP score/percentile converter - 04/25/22 05:30 PM

Does anyone know of a percentile converter for the science portion of the MAPS tests? My son scored 236 in the fall of 5th grade (2021-2022 school year).


Thank you!
Posted by: indigo

Re: URL for NWEA 2015 MAP score/percentile converter - 04/28/22 10:51 AM

Bumping this post of April 25, 2022, to increase the opportunity for it to be noticed and answered.
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Originally Posted By: ameeeesmith
Does anyone know of a percentile converter for the science portion of the MAPS tests? My son scored 236 in the fall of 5th grade (2021-2022 school year).

Thank you!
Posted by: aeh

Re: URL for NWEA 2015 MAP score/percentile converter - 04/28/22 12:46 PM

This is the 2020 norms document, which gives means and SDs for each grade level (they don't re-norm every year):
https://teach.mapnwea.org/impl/MAPGrowthNormativeDataOverview.pdf

So, for example, amee's DC would be just over +3 SDs above the mean, which is above the 99th %ile.

EDIT:
Here's the actual percentile document. p. 149 is the one you're looking for:
https://teach.mapnwea.org/impl/normsResearchStudy.pdf