obtang number of cases for congressional districts

[Euslaner]

obtaing number of cases for a variable

I have a survwy data set tat includes the congreessional district with a variable I have aed cdstat, ncoded to be a floating variable. I cannot determine how mnny cases all into each district. To get rasonable estimate in an aggregate analysis I need at least 40 cases per district. How do I get a measure of the number of cases in each district? I

the cdstate variable for the cdstate is:

56863. WA02
56864. WA02
56865. WA02
56866. WA02
56867. WA02
56868. WA02
56869. WA02
56870. WA02
56871. WA02
56872. WA02
56873. WA02
56874. WA02
56875. WA02
56876. WA02
56877. WA02
56878. WA02
56879. WA02
56880. WA02
56881. WA02
56882. WA02
56883. WA02
56884. WA02
56885. WA02
56886. WA02
56887. WA02
56888. WA02
56889. WA02
56890. WA02
56891. WA02
56892. WA02
56893. WA02
56894. WA02
56895. WA02
56896. WA02
56897. WA02
56898. WA02
56899. WA02
56900. WA02
56901. WA02
56902. WA02
56903. WA02
56904. WA02
56905. WA02
56906. WA02
56907. WA02
56908. WA02
56909. WA02
56910. WA02
56911. WA02
56912. WA02
56913. WA02
56914. WA02
56915. WA02
56916. WA02
56917. WA02
56918. WA02
56919. WA02
56920. WA02
56921. WA02
56922. WA02
56923. WA02
56924. WA02
56925. WA02
56926. WA02
56927. WA02
56928. WA02
56929. WA02
56930. WA02
56931. WA02
56932. WA02
56933. WA02
56934. WA02
56935. WA02
56936. WA02
56937. WA02
56938. WA02
56939. WA02
56940. WA02
56941. WA02
56942. WA02
56943. WA02
56944. WA02
56945. WA02
56946. WA02
56947. WA02
56948. WA02
56949. WA02
56950. WA02
56951. WA02
56952. WA02
56953. WA02
56954. WA02
56955. WA02
56956. WA02
56957. WA02
56958. WA02
56959. WA02
56960. WA02
56961. WA02
56962. WA02
56963. WA02
56964. WA02
56965. WA02
56966. WA02
56967. WA02
56968. WA02
56969. WA02
56970. WA02
56971. WA02
56972. WA02
56973. WA02
56974. WA02
56975. WA02
56976. WA02
56977. WA02
56978. WA02
56979. WA02
56980. WA02
56981. WA02
56982. WA02
56983. WA02
56984. WA02
56985. WA02
56986. WA03
56987. WA03
56988. WA03
56989. WA03
56990. WA03
56991. WA03
56992. WA03
56993. WA03
56994. WA03
56995. WA03
56996. WA03
56997. WA03
56998. WA03
56999. WA03
57000. WA03
57001. WA03
57002. WA03
57003. WA03
57004. WA03
57005. WA03
57006. WA03
57007. WA03
57008. WA03
57009. WA03
57010. WA03
57011. WA03
57012. WA03
57013. WA03
57014. WA03
57015. WA03
57016. WA03
57017. WA03
57018. WA03
57019. WA03
57020. WA03
57021. WA03
57022. WA03
57023. WA03
57024. WA03
57025. WA03
57026. WA03
57027. WA03
57028. WA03
57029. WA03
57030. WA03
57031. WA03
57032. WA03
57033. WA03
57034. WA03
57035. WA03
57036. WA03
57037. WA03
57038. WA03
57039. WA03
57040. WA03
57041. WA03
57042. WA03
57043. WA03
57044. WA03
57045. WA03
57046. WA03
57047. WA03
57048. WA03
57049. WA03
57050. WA03
57051. WA03
57052. WA03
57053. WA03
57054. WA03
57055. WA03
57056. WA03
57057. WA03
57058. WA03
57059. WA03
57060. WA03
57061. WA03
57062. WA03
57063. WA03
57064. WA03
57065. WA03
57066. WA03
57067. WA03
57068. WA03
57069. WA03
57070. WA03
57071. WA03
57072. WA03
57073. WA03
57074. WA03
57075. WA03
57076. WA03
57077. WA03
57078. WA03
57079. WA03
57080. WA03
57081. WA03
57082. WA03
57083. WA03
57084. WA03
57085. WA03
57086. WA03
57087. WA03
57088. WA03
57089. WA04
57090. WA04
57091. WA04
57092. WA04
57093. WA04
57094. WA04
57095. WA04
57096. WA04
57097. WA04
57098. WA04
57099. WA04
57100. WA04
57101. WA04
57102. WA04
57103. WA04
57104. WA04
57105. WA04
57106. WA04
57107. WA04
57108. WA04
57109. WA04
57110. WA04
57111. WA04
57112. WA04
57113. WA04
57114. WA04
57115. WA04
57116. WA04
57117. WA04
57118. WA04
57119. WA04
57120. WA04
57121. WA04
57122. WA04
57123. WA04
57124. WA04
57125. WA04
57126. WA04
57127. WA04
57128. WA04
57129. WA04
57130. WA04
57131. WA04
57132. WA04
57133. WA04
57134. WA04
57135. WA05
57136. WA05
57137. WA05
57138. WA05
57139. WA05
57140. WA05
57141. WA05
57142. WA05
57143. WA05
57144. WA05
57145. WA05
57146. WA05
57147. WA05
57148. WA05
57149. WA05
57150. WA05
57151. WA05
57152. WA06
57153. WA06
57154. WA06
57155. WA06
57156. WA06
57157. WA06
57158. WA06
57159. WA06
57160. WA06
57161. WA06
57162. WA06
57163. WA06
57164. WA06
57165. WA06
57166. WA06
57167. WA06
57168. WA06
57169. WA06
57170. WA06
57171. WA06
57172. WA06
57173. WA06
57174. WA06
57175. WA06
57176. WA06
57177. WA06
57178. WA06
57179. WA06
57180. WA06
57181. WA06
57182. WA06
57183. WA06
57184. WA06
57185. WA06
57186. WA06
57187. WA06
57188. WA06
57189. WA06
57190. WA06
57191. WA06
57192. WA06
57193. WA06
57194. WA06
57195. WA06
57196. WA06
57197. WA06
57198. WA06
57199. WA06
57200. WA06
57201. WA06
57202. WA06
57203. WA06
57204. WA06
57205. WA06
57206. WA06
57207. WA06
57208. WA06
57209. WA06
57210. WA06
57211. WA06
57212. WA06
57213. WA06
57214. WA06
57215. WA06
57216. WA06
57217. WA06
57218. WA06
57219. WA06
57220. WA06
57221. WA06
57222. WA06
57223. WA06
57224. WA06
57225. WA06
57226. WA06
57227. WA06
57228. WA06
57229. WA06
57230. WA06
57231. WA06
57232. WA06
57233. WA06
57234. WA06
57235. WA06
57236. WA06
57237. WA06
57238. WA06
57239. WA06
57240. WA06
57241. WA06
57242. WA06
57243. WA06
57244. WA06
57245. WA06
57246. WA06
57247. WA06
57248. WA06
57249. WA06
57250. WA06
57251. WA06
57252. WA06
57253. WA06
57254. WA07
57255. WA07
57256. WA07
57257. WA07
57258. WA07
57259. WA07
57260. WA07
57261. WA07
57262. WA07
57263. WA07
57264. WA07
57265. WA07
57266. WA07
57267. WA07
57268. WA07
57269. WA07
57270. WA07
57271. WA07
57272. WA07
57273. WA07
57274. WA07
57275. WA07
57276. WA07
57277. WA07
57278. WA07
57279. WA07
57280. WA07
57281. WA07
57282. WA07
57283. WA07
57284. WA07
57285. WA07
57286. WA07
57287. WA07
57288. WA07
57289. WA07
57290. WA07
57291. WA07
57292. WA07
57293. WA07
57294. WA07
57295. WA07
57296. WA07
57297. WA07
57298. WA07
57299. WA07
57300. WA07
57301. WA07
57302. WA07
57303. WA07
57304. WA07
57305. WA07
57306. WA07
57307. WA07
57308. WA07
57309. WA07
57310. WA07
57311. WA07
57312. WA07
57313. WA07
57314. WA07
57315. WA07
57316. WA07
57317. WA07
57318. WA07
57319. WA07
57320. WA07
57321. WA07
57322. WA07
57323. WA07
57324. WA07
57325. WA07
57326. WA07
57327. WA07
57328. WA07
57329. WA07
57330. WA07
57331. WA07
57332. WA07
57333. WA07
57334. WA07
57335. WA07
57336. WA07
57337. WA07
57338. WA07
57339. WA07
57340. WA07
57341. WA07
57342. WA07
57343. WA07
57344. WA07
57345. WA07
57346. WA07
57347. WA07
57348. WA07
57349. WA07
57350. WA07
57351. WA07
57352. WA07
57353. WA07
57354. WA07
57355. WA07
57356. WA07
57357. WA07
57358. WA07
57359. WA07
57360. WA07
57361. WA07
57362. WA07
57363. WA07
57364. WA07
57365. WA07
57366. WA07
57367. WA07
57368. WA07
57369. WA07
57370. WA07
57371. WA07
57372. WA07
57373. WA07
57374. WA07
57375. WA07
57376. WA07
57377. WA07
57378. WA07
57379. WA07
57380. WA07
57381. WA07
57382. WA07
57383. WA07
57384. WA07
57385. WA07
57386. WA07
57387. WA07
57388. WA07
57389. WA07
57390. WA07
57391. WA07
57392. WA07
57393. WA07
57394. WA07
57395. WA07
57396. WA07
57397. WA07
57398. WA07
57399. WA07
57400. WA07
57401. WA07
57402. WA07
57403. WA07
57404. WA07
57405. WA07
57406. WA07
57407. WA07
57408. WA07
57409. WA07
57410. WA07
57411. WA07
57412. WA07
57413. WA07
57414. WA07
57415. WA07
57416. WA07
57417. WA07
57418. WA07
57419. WA07
57420. WA07
57421. WA07
57422. WA07
57423. WA07
57424. WA07
57425. WA07
57426. WA07
57427. WA07
57428. WA07
57429. WA07
57430. WA07
57431. WA07
57432. WA07
57433. WA07
57434. WA07
57435. WA07
57436. WA07
57437. WA07
57438. WA07
57439. WA07
57440. WA07
57441. WA07
57442. WA07
57443. WA07
57444. WA07
57445. WA07
57446. WA07
57447. WA07
57448. WA07
57449. WA07
57450. WA07
57451. WA07
57452. WA07
57453. WA07
57454. WA07
57455. WA07
57456. WA07
57457. WA07
57458. WA07
57459. WA07
57460. WA07
57461. WA07
57462. WA07
57463. WA07
57464. WA07
57465. WA07
57466. WA07
57467. WA07
57468. WA07
57469. WA07
57470. WA07
57471. WA07
57472. WA07
57473. WA07
57474. WA07
57475. WA07
57476. WA07
57477. WA07
57478. WA07
57479. WA07
57480. WA07
57481. WA07
57482. WA07
57483. WA07
57484. WA07
57485. WA07
57486. WA07
57487. WA07
57488. WA07
57489. WA07
57490. WA07
57491. WA07
57492. WA08
57493. WA08
57494. WA08
57495. WA08
57496. WA08
57497. WA08
57498. WA08
57499. WA08
57500. WA08
57501. WA08
57502. WA08
57503. WA08
57504. WA08
57505. WA08
57506. WA08
57507. WA08
57508. WA08
57509. WA08
57510. WA08
57511. WA08
57512. WA08
57513. WA08
57514. WA08
57515. WA08
57516. WA08
57517. WA08
57518. WA08
57519. WA08
57520. WA08
57521. WA08
57522. WA08
57523. WA08
57524. WA08
57525. WA08
57526. WA08
57527. WA08
57528. WA08
57529. WA08
57530. WA08
57531. WA08
57532. WA08
57533. WA08
57534. WA08
57535. WA08
57536. WA08
57537. WA08
57538. WA08
57539. WA08
57540. WA08
57541. WA08
57542. WA08
57543. WA08
57544. WA08
57545. WA08
57546. WA08
57547. WA08
57548. WA08
57549. WA08
57550. WA08
57551. WA08
57552. WA08
57553. WA08
57554. WA08
57555. WA08
57556. WA08
57557. WA08
57558. WA08
57559. WA08
57560. WA08
57561. WA08
57562. WA08
57563. WA08
57564. WA08
57565. WA08
57566. WA08
57567. WA08
57568. WA08
57569. WA08
57570. WA08
57571. WA08
57572. WA08
57573. WA08
57574. WA08
57575. WA08
57576. WA08
57577. WA08
57578. WA08
57579. WA08
57580. WA08
57581. WA08
57582. WA08
57583. WA09
57584. WA09
57585. WA09
57586. WA09
57587. WA09
57588. WA09
57589. WA09
57590. WA09
57591. WA09
57592. WA09
57593. WA09
57594. WA09
57595. WA09
57596. WA09
57597. WA09
57598. WA09
57599. WA09
57600. WA09
57601. WA09
57602. WA09
57603. WA09
57604. WA09
57605. WA09
57606. WA09
57607. WA09
57608. WA09
57609. WA09
57610. WA09
57611. WA09
57612. WA09
57613. WA09
57614. WA09
57615. WA09
57616. WA09
57617. WA09
57618. WA09
57619. WA09
57620. WA09
57621. WA09
57622. WA09
57623. WA09
57624. WA09
57625. WA09
57626. WA09
57627. WA09
57628. WA09
57629. WA09
57630. WA09
57631. WA09
57632. WA09
57633. WA09
57634. WA09
57635. WA09
57636. WA09
57637. WA09
57638. WA09
57639. WA09
57640. WA09
57641. WA09
57642. WA09
57643. WA09
57644. WA09
57645. WA09
57646. WA09
57647. WA09
57648. WA09
57649. WA09
57650. WA09
57651. WA09
57652. WA09
57653. WA09
57654. WA09
57655. WA09
57656. WA09
57657. WA09
57658. WA09
57659. WA09
57660. WA09
57661. WA09
57662. WA09
57663. WA09
57664. WA09
57665. WA09
57666. WA09
57667. WA09
57668. WA09
57669. WA09
57670. WA09
57671. WA09
57672. WA09
57673. WA09
57674. WA09
57675. WA09
57676. WA09
57677. WA10
57678. WA10
57679. WA10
57680. WA10
57681. WA10
57682. WA10
57683. WA10
57684. WA10
57685. WA10
57686. WA10
57687. WA10
57688. WA10
57689. WA10
57690. WA10
57691. WA10
57692. WI01
57693. WI01
57694. WI01
57695. WI01
57696. WI01
57697. WI01
57698. WI01
57699. WI01
57700. WI01
57701. WI01
57702. WI01
57703. WI01
57704. WI01
57705. WI01
57706. WI01
57707. WI01
57708. WI01
57709. WI01
57710. WI01
57711. WI01
57712. WI01
57713. WI01
57714. WI01
57715. WI01
57716. WI01
57717. WI01
57718. WI01
57719. WI01
57720. WI01
57721. WI01
57722. WI01
57723. WI01
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57725. WI01
57726. WI01
57727. WI01
57728. WI01
57729. WI01
57730. WI01
57731. WI01
57732. WI01
57733. WI01
57734. WI01
57735. WI01
57736. WI01
57737. WI01
57738. WI02
57739. WI02
57740. WI02
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57742. WI02
57743. WI02
57744. WI02
57745. WI02
57746. WI02
57747. WI02
57748. WI02
57749. WI02
57750. WI02
57751. WI02
57752. WI02
57753. WI02
57754. WI02
57755. WI02
57756. WI02
57757. WI02
57758. WI02
57759. WI02
57760. WI02
57761. WI02
57762. WI02
57763. WI02
57764. WI02
57765. WI02
57766. WI02
57767. WI02
57768. WI02
57769. WI02
57770. WI02
57771. WI02
57772. WI02
57773. WI02
57774. WI02
57775. WI02
57776. WI02
57777. WI02
57778. WI02
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57780. WI02
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57800. WI02
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57802. WI02
57803. WI02
57804. WI02
57805. WI02
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57807. WI02
57808. WI02
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57829. WI03
57830. WI03
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57838. WI03
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57840. WI03
57841. WI03
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57849. WI03
57850. WI03
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57871. WI04
57872. WI04
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57877. WI04
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57880. WI04
57881. WI04
57882. WI04
57883. WI04
57884. WI04
57885. WI04
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57888. WI04
57889. WI04
57890. WI04
57891. WI04
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57896. WI04
57897. WI04
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57899. WI04
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57902. WI04
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57906. WI04
57907. WI04
57908. WI04
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57912. WI04
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57919. WI04
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57922. WI04
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57926. WI04
57927. WI04
57928. WI04
57929. WI04
57930. WI04
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57989. WI04
57990. WI04
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[Nick Cox]

I can only make a wild guess at what is needed here. Check out distinct from the Stata Journal.

SJ-23-4 dm0042_5  . . . . . . . . . . . . . . . . Software update for distinct
        (help distinct, distinctgen if installed)  N. J. Cox and G. M. Longton
        Q4/23   SJ 23(4):1096
        comments out (and thus removes) a call to clear Mata at the
        close of work, which was frustrating some other projects
        also using Mata

SJ-23-2 dm0042_4  . . . . . . . . . . . . . . . . Software update for distinct
        (help distinct, distinctgen if installed)  N. J. Cox and G. M. Longton
        Q2/23   SJ 23(2):595--596
        most important change is addition of distinctgen command

SJ-20-4 dm0042_3  . . . . . . . . . . . . . . . . Software update for distinct
        (help distinct if installed)  . . . . . .  N. J. Cox and G. M. Longton
        Q4/20   SJ 20(4):1028--1030
        sort() option has been added

SJ-20-2 pr0046_1  . . . . . . . . . . .  Speaking Stata: More ways for rowwise
        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
        Q2/20   SJ 20(2):481--488                                (no commands)
        focuses on returning which variable or variables are equal
        to the maximum or minimum in a row

SJ-15-3 dm0042_2  . . . . . . . . . . . . . . . . Software update for distinct
        (help distinct if installed)  . . . . . .  N. J. Cox and G. M. Longton
        Q3/15   SJ 15(3):899
        improved table format and display of large numbers of
        observations

SJ-12-2 dm0042_1  . . . . . . . . . . . . . . . . Software update for distinct
        (help distinct if installed)  . . . . . .  N. J. Cox and G. M. Longton
        Q2/12   SJ 12(2):352
        options added to restrict output to variables with a minimum
        or maximum of distinct values

SJ-8-4  dm0042  . . . . . . . . . . . .  Speaking Stata: Distinct observations
        (help distinct if installed)  . . . . . .  N. J. Cox and G. M. Longton
        Q4/08   SJ 8(4):557--568
        shows how to answer questions about distinct observations
        from first principles; provides a convenience command

The 2008 paper explains the principles; the last 2023 update signals the version to install.

[Euslaner]

Thanks but now I have:

fre cdstate

cdstate -- SAMPLE DESCRIPTION: State and Congressional District- Postal Abbrev and CD
--------------------------------------------------------------
| Freq. Percent Valid Cum.
-----------------+--------------------------------------------
Valid 1 9999 | 4997 8.43 8.43 8.43
2 AK01 | 6 0.01 0.01 8.44
3 AL01 | 33 0.06 0.06 8.50
4 AL02 | 252 0.43 0.43 8.92
5 AL03 | 144 0.24 0.24 9.16
6 AL04 | 29 0.05 0.05 9.21
7 AL05 | 83 0.14 0.14 9.35
8 AL06 | 253 0.43 0.43 9.78
9 AL07 | 198 0.33 0.33 10.11
10 AR01 | 426 0.72 0.72 10.83
11 AR02 | 189 0.32 0.32 11.15
12 AR03 | 44 0.07 0.07 11.23
13 AR04 | 418 0.71 0.71 11.93
14 AR05 | 68 0.11 0.11 12.05
15 AR06 | 10 0.02 0.02 12.06
16 AZ01 | 163 0.27 0.27 12.34
17 AZ02 | 65 0.11 0.11 12.45
18 AZ03 | 140 0.24 0.24 12.68
19 AZ04 | 100 0.17 0.17 12.85
20 AZ05 | 63 0.11 0.11 12.96
: | : : : :
478 WA04 | 46 0.08 0.08 96.38
479 WA05 | 17 0.03 0.03 96.41
480 WA06 | 102 0.17 0.17 96.59
481 WA07 | 238 0.40 0.40 96.99
482 WA08 | 91 0.15 0.15 97.14
483 WA09 | 94 0.16 0.16 97.30
484 WA10 | 15 0.03 0.03 97.32
485 WI01 | 46 0.08 0.08 97.40
486 WI02 | 75 0.13 0.13 97.53
487 WI03 | 43 0.07 0.07 97.60
488 WI04 | 274 0.46 0.46 98.06
489 WI05 | 220 0.37 0.37 98.43
490 WI06 | 226 0.38 0.38 98.82
491 WI07 | 26 0.04 0.04 98.86
492 WI08 | 26 0.04 0.04 98.90
493 WI09 | 172 0.29 0.29 99.19
494 WV01 | 241 0.41 0.41 99.60
495 WV02 | 24 0.04 0.04 99.64
496 WV03 | 177 0.30 0.30 99.94
497 WY01 | 36 0.06 0.06 100.00
Total | 59277 100.00 100.00
--------------------------------------------------------------

I have two issues. First when I try to drop cdstate = 9999 I can't do so.
Second, I can't access the values for cdstate between 21 and 477. There must be a way to do so. Thanks for any help.

[Nick Cox]

help drop 
drop if cdstate == 9999

[Choonjoo Lee]

The output shows that 9999 is the value label attached to the numeric value 1.
To remove those observations, run:

drop if cdstate == 1

The values between 21 and 477 are omitted because fre displays only the first and last 20 values by default.
To display all values, run:

fre cdstate, all

[Nick Cox]

Choonjoo Lee is quite correct. It seems that cdstate has been encoded and "9999" (as some kind of code for missing values?) comes before "AK01" in alphanumeric order.

So

drop if cdstate == 1

is indeed a much better guess.

fre is from SSC.