# Wikiversity:Help desk/archives/May 2008

## Regression analysis

I would like to know how to get a formula or group of formulas from a set of numbers. From analyzing the data, I know that I will need a formula for the first several numbers, another formula for the odd other numbers, and another formula for the even other numbers. I think regression analysis would help but I can't seem to find a calculator or computer program that will do modulus piecewise formulaic regression when I don't even know where to start. Here are the numbers:

Set 1 x------y------To next x value 2------15----------+37 3------52----------+70 4------122--------+115 5------237--------+169 6------406--------+231 7------637--------+305 8------942--------+384 9------1326------+474 10----1800------+569 11----2369------+672 12----3041------+781 13----3822------+897 14----4719------+1018 15----5737------+1144 16----6881------+1274 17----8155------+1409 18----9564------+1547 19----11111----+1689 20----12800----+1832 21----14632----+1978 22----16610----+2127 23----18737----+2275 24----21012----+2425 25----23437----+2575 26----26012----+2725 27----28737----+2873 28----31610----+3022 29----34632----+3168 30----37800----+3311 31----41111----+3453 32----44564----+3591 33----48155----+3726 34----51881----+3856 35----55737----+3982 36----59719----+4103 37----63822----+4219 38----68041----+4328 39----72369----+4431 40----76800----+4526 41----81326----+4616 42----85942----+4695 43----90637----+4769 44----95406----+4831 45----100273--+4885 46----105122--+4930 47----110052--+4963 48----115015--+4986 49----120001--+4999 50----125000--+6324 51----131324--+6471 52----137795--+6615 53----144410--+6755 54----151165--+6891 55----158056--+7023 56----165079--+7150 57----172229--+7274 58----179503--+7391 59----186894--+7506 60----194400--+7613 61----202013--+7715 62----209728--+7812 63----217540--+7903 64----225443--+7988 65----233431--+8065 66----241496--+8137 67----249633--+8201 68----257834--+9572 69----267406--+9052 70----276458--+9870 71----286328--+10030 72----296358--+9409 73----305767--+10307 74----316074--+10457 75----326531--+9724 76----336255--+10710 77----346965--+10847 78----357812--+9995 79----367807--+11073 80----378880--+11197 81----390077--+10216 82----400293--+11393 83----411686--+11504 84----423190--+10382 85----433572--+11667 86----445239--+11762 87----457001--+10488 88----467489--+11889 89----479378--+11968 90----491346--+10532 91----501878--+12056 92----513934--+12115 93----526049--+10508 94----536557--+12163 95----548720--+12202 96----560922--+10411 97----571333--+12206 98----583539--+8343 99----591882--+8118 100--600000

Set 2 x------y---------To next x value 1------1--------------+3 2------4--------------+9 3------13------------+19 4------32------------+33 5------65------------+47 6------112----------+66 7------178----------+98 8------276----------+117 9------393----------+147 10----540----------+205 11----745----------+222 12----967----------+263 13----1230--------+361 14----1591--------+366 15----1957--------+500 16----2457--------+589 17----3046--------+686 18----3732--------+794 19----4526--------+914 20----5440--------+1042 21----6482--------+1184 22----7666--------+1337 23----9003--------+1503 24----10506------+1681 25----12187------+1873 26----14060------+2080 27----16140------+2299 28----18438------+2535 29----20974------+2786 30----23760------+3051 31----26811------+3335 32----30146------+3634 33----33780------+3951 34----37731------+4286 35----42017------+4639 36----46656------+3997 37----50653------+5316 38----55969------+4536 39----60505------+6055 40----66560------+5117 41----71677------+6856 42----78533------+5744 43----84277------+7721 44----91998------+6417 45----98415------+8654 46----107069----+7136 47----114205----+9658 48----123863----+7903 49----131766----+10734 50----142500----+8722 51----151222----+11883 52----163105----+9592 53----172697----+13110 54----185807----+10515 55----196322----+14417 56----210739----+11492 57----222231----+15805 58----238036----+12526 59----250562----+17278 60----267840----+13616 61----281456----+18837 62----300293----+14766 63----315059----+20485 64----335544----+15976 65----351520----+22224 66----373744----+17247 67----390991----+25059 68----415050----+18581 69----433631----+25989 70----459620----+19980 71----479600----+28017 72----507617----+21446 73----529063----+30146 74----559209----+22978 75----582187----+32379 76----614566----+24580 77----639146----+34717 78----673863----+26252 79----700115----+37165 80----737280----+27996 81----765275----+39722 82----804997----+29812 83----834809----+42392 84----877201----+31704 85----908905----+45179 86----954084----+33670 87----987754----+48083 88----1035837--+35715 89----1071552--+51108 90----1122660--+37839 91----1160499--+54254 92----1214753--+40043 93----1254796--+57526 94----1312322--+42330 95----1354652--+60925 96----1415577--+44699 97----1460276--+64455 98----1524731--+47153 99----1571884--+68116 100--1640000

I was not able to make a table. Someone please make a table from this data.

For the syntax of wikitables, see meta:help:table. For the dynamics, see meta:template:for, especially the examples. We can try to make it work if it gets stuck. Hillgentleman|Talk 17:51, 3 May 2008 (UTC)

## Four point probe method

what is Four point probe method in semi conductor resistivity measurement, (The preceding unsigned comment was added by Shraktu (talkcontribs) 16:47, 25 May 2008), ----Erkan Yilmaz uses the Wikiversity:Chat (try) PS: Tag a learning project with completion status !! 17:06, 25 May 2008 (UTC)

See here: [1]. StuRat 23:01, 25 May 2008 (UTC)