*313The opinion of the court was delivered by
Biles, J.:Jimmy Murdock argues the district court erroneously calculated his criminal history score during a sentencing proceeding by treating two prior out-of-state convictions from 1984 and 1990 as person crimes instead of nonperson crimes. The issue is rare because these prior out-of-state offenses were committed before enactment of the Kansas Sentencing Guidelines Act (KSGA), K.S.A. 21-4701 et seq., and the KSGA does not expressly provide how such offenses should be classified. We conclude these convictions should be treated as nonperson offenses. Accordingly, we reverse and remand for resentencing with directions to classify the two prior out-of-state convictions as nonperson offenses.
Factual and Procedural Background
Murdock pleaded guilty to two counts of aggravated robbery and one count of robbery for crimes occurring in December 2008. To calculate his sentence, the district court found Murdock had two Illinois robbery convictions from 1984 and 1990 and a 1996 Kansas robbery conviction. It classified all three prior convictions as person offenses, which gave Murdock three or more adult convictions for person felonies. This treatment placed him in criminal history category A under K.S.A. 21-4709. Murdock was sentenced to 233 months’ imprisonment for the first aggravated robbery conviction and concurrent 36-month sentences for the remaining two convictions. He would have fallen within criminal history category C if the two out-of-state convictions had been designated as nonperson offenses, resulting in a lesser sentence. See K.S.A. 21-4709; K.S.A. 21-4704.
Murdock timely appealed his sentences to the Court of Appeals, arguing the two out-of-state convictions were wrongly classified as person offenses. The Court of Appeals affirmed the district court in State v. Murdock, No. 104,533, 2011 WL 4031550, at *3 (Kan. App. 2011) (unpublished opinion). Murdock petitioned for this court’s review, which was granted under K.S.A. 20-3018(b), with this court obtaining jurisdiction under K.S.A. 60-2101(b).
*314Analysis
The issue is whether the district court improperly scored Mur-dock’s criminal history because it classified his two Illinois robbeiy convictions as person offenses. Murdock argues both crimes should have been scored as nonperson offenses under K.S.A. 21-4710(d)(8). In the alternative, he contends this court should determine the legislature intended to designate pre-1993 convictions as nonperson offenses.
Standard of Review
This case turns on the interpretation of several sentencing statutes. Statutory interpretation is a question of law subject to unlimited appellate review. State v. Guder, 293 Kan. 763, 765, 267 P.3d 763 (2012). If a statute is plain and unambiguous, appellate courts do not speculate about legislative intent or resort to canons of construction or legislative history. State v. Coman, 294 Kan. 84, 92, 273 P.3d 701 (2012).
Classifying pre-KSGA convictions
In scoring criminal history under the KSGA, distinctions are made between person and nonperson crimes. Compare K.S.A. 21-3427 (aggravated robbery is a person offense) with K.S.A. 21-3701 (theft is a nonperson offense). Generally speaking, person crimes are weighted more heavily than nonperson crimes. See K.S.A. 21-4709.
K.S.A. 21-4711(e) governs the classification of out-of-state crimes/convictions. It states in pertinent part:
“The state of Kansas shall classify the [prior out-of-state] crime as person or nonperson. In designating a crime as person or nonperson comparable offenses shall be referred to. If the state of Kansas does not have a comparable offense, the out-of-state conviction shall be classified as a nonperson crime.” K.S.A. 21-4711(e).
The KSGA does not define comparable offense, but this court has previously held a comparable offense is determined by comparing the elements of the crimes, stating that “the offenses need only be comparable, not identical.” State v. Vandervort, 276 Kan. 164, 179, 72 P.3d 925 (2003).
*315Murdock does not dispute that his out-of-state robbery convictions are comparable to the Kansas crime of robbery, and a review of the elements of those crimes supports this admission. Compare Ill. Comp. Stat. ch. 270 5/18-l(a) (2003) with K.S.A. 21-3426. But one must also identify the correct version of our Kansas statute to malee this comparison, which is where Murdock’s dispute draws its focus.
Kansas did not begin categorizing crimes as person or nonperson offenses until 1993 when the KSGA was adopted. See L. 1992, ch. 239, sec. 1 (KSGA effective July 1, 1993). When Murdock was convicted of the Illinois robberies (which were felony offenses) in 1984 and 1990, Kansas simply defined robbery as a “class C felony.” K.S.A. 21-3426 (Ensley 1981). The record does not disclose the dates when the out-of-state offenses were committed, but K.S.A. 21-3426 (Ensley 1981) was not amended from the prior enactment in 1969 until 1992. See K.S.A. 21-3426 (historical notes). Therefore, it is obvious the same penalty provision was in effect at the time Murdock committed his out-of-state offenses. In December 2008, when Murdock committed the current crimes of conviction, Kansas defined robbery as a “severity level 5, person felony.” K.S.A. 21-3426.
Murdock argues the comparable offense to his Illinois robbery convictions is K.S.A. 21-3426 (Ensley 1981)—the statute in effect when the Illinois crimes were committed. He notes K.S.A. 21-4710(d)(8), which pertains to scoring unclassified crimes, states: “Unless otherwise provided by law, unclassified felonies and misdemeanors, shall be considered and scored as nonperson crimes for the purpose of determining criminal history.” This statute, he reasons, requires his Illinois convictions to be treated as nonperson offenses based’on this court’s holding in State v. Williams, 291 Kan. 554, Syl. ¶ 4, 244 P.3d 667 (2010), that the comparable Kansas offenses must be determined as of the date the defendant committed the out-of-state crimes.
In the Williams case, Williams had pleaded guilty to two counts of identity theft for crimes occurring in 2005 and 2006. Her criminal history was scored based on five State of Washington convictions for identity theft that she had committed between December *3162001 and September 2002. At the time Williams committed those out-of-state crimes, Kansas classified identity theft—the comparable offense—as a person offense, but it had reclassified that crime as a nonperson offense by the time Williams committed and was sentenced for her Kansas crimes. The parties disputed whether the comparable offense should be determined as of the date of her Kansas sentencing, when she committed the Kansas offenses, or when Williams committed the prior Washington offenses.
The Williams court held that in the absence of a statutory directive a comparable offense should be determined as of the date the prior crime was committed. This outcome, the court reasoned, was “consistent with our fundamental rule of sentencing for a current in-state crime: sentencing in accordance with the penalty provisions in effect at the time the crime was committed.” 291 Kan. at 560. The court further held that fixing the penalty parameters for an offense “ ‘as of the date of the commission of the offense is fair, logical and easy to apply.’ ” 291 Kan. at 560 (quoting Vandervort, 276 Kan. at 180).
Since then, the Court of Appeals has followed Williams when the prior out-of-state offense was committed after the Kansas sentencing guidelines were adopted in 1993. See, e.g., State v. McKinney, No. 102,906, 2010 WL 5185779, at *1 (Kan. App. 2010) (unpublished opinion) (scoring a 2002 Oklahoma conviction based on the designation for the comparable Kansas offense at the time the Oklahoma offense was committed). But the Court of Appeals, including the Murdock panel, has adopted a different rule when the prior out-of-state crimes were committed before Kansas adopted the person/nonperson offense designation in 1993.
The Murdock panel held that pre-1993 offenses should be designated based on the current guidelines offenses, reasoning: “Kansas courts have routinely classified pre-1993 offenses as either person or nonperson for criminal history purposes by comparing the offenses to current guidelines offenses.“ (Emphasis added.) Murdock, 2011 WL 4031550, at *2; see State v. Mitchell, No. 104,833, 2012 WL 1649831, at *7 (Kan. App. 2012) (unpublished opinion), petition for rev. filed June 4, 2012; State v. Mims, No. 103,044, 2011 WL 4563068, at *5 (Kan. App. 2011) (unpublished opinion).
*317Notably, this reference to “current guidelines offenses” is ambiguous. For example, how is the panel’s rule applied in cases like Williams when the legislature modified the classification after the KSGA was adopted? Seemingly, the rule would conflict with this court’s controlling law as stated in Williams. In addition, the view followed by the Court of Appeals in diese cases is troubling because it originated in a series of Court of Appeals cases that predate this court’s Williams decision. See, e.g., State v. Henderson, No. 100,371, 2009 WL 2948657, at *3 (Kan. App. 2009) (unpublished opinion), rev. denied 290 Kan. 1099 (2010); State v. Boster, No. 101,009, 2009 WL 3738490, at *4 (Kan. App. 2009) (unpublished opinion), rev. denied 290 Kan. 1096 (2010). The Murdock panel did not address Williams in its analysis despite citing it as holding “comparable Kansas offenses are determined by the date the defendant committed tire prior out-of-state offenses” while summarizing Murdock’s claims. Murdock, 2011 WL 4031550, at *1 (citing Williams, 291 Kan. at 560-62).
The panel did cite Farris v. McKune, 259 Kan. 181, 185-86, 911 P.2d 177 (1996), as sufficiently analogous to support its holding. Murdock, 2011 WL 4031550, at *2. But Farris is not applicable because it addresses the Department of Corrections’ conversion of three offenders’ preguidelines sentences to the sentencing guidelines, which was controlled by K.S.A. 21-4724(c)(l). The Farris court held that “ ‘[i]n converting a sentence, the legislature intended that the Department of Corrections use records available to it to determine what the defendant did when the crime was committed and convert that crime to an analogous crime existing after July 1, 1993.’ ” 259 Kan. at 195 (quoting State v. Fierro, 257 Kan. 639, 650, 895 P.2d 186 [1995]). The KSGA lacks- a similar provision for persons who were not imprisoned at the time the KSGA was enacted.
In the absence of a statutory directive, we are left with our decision in Williams that the comparable Kansas offense should be determined as of the date the out-of-state offenses were committed. Even though the State seeks a different rule in this appeal, we must emphasize we adopted the current rule at the State’s urging in Williams. See 291 Kan. at 559 (State argued this court should *318score the Washington offenses according to their Kansas equivalents when the Washington offenses were committed).
Our analysis in Williams is indistinguishable from the analysis applicable to the circumstances presented here, and the same policy considerations continue to apply. Using the date a prior out-of-state crime was committed to calculate a defendant’s criminal history score is “consistent with our fundamental rule of sentencing for a current in-state crime: sentencing in accordance with the penalty provisions in effect at the time the crime was committed.” 291 Kan, at 560. Moreover, fixing the penalty parameters as of the date the crime was committed is fair, logical, and easy to apply. 291 Kan. at 560. Applying that rule, robbery as defined in K.S.A. 21-3426 (Ensley 1981) is die comparable Kansas offense. The penalty. provision of that pre-1993 statute classifies 'robbery as a class C felony, and it does not designate the offense as person or nonperson.
Finally, since the statute does not specify whether it is a person or nonperson offense, Murdock argues it must be scored as a nonperson offense under K.S.A. 21-4710(d)(8), which provides that “unclassified felonies and misdemeanors, shall be considered and are scored as nonperson offenses for die purposes of determining criminal history.” The plain language of the statute seems to apply in this circumstance, altiiough the legislature refers to person or nonperson offenses as “designations,” not “classifications,” in K.S.A. 21-4711(e), (g). Notably, neither of these terms is defined in K.S.A. 21-4703.
Murdock’s view is misplaced. And although there may be other twists placed on the statute, it is likely K.S.A. 21-4710(d)(8) was adopted to address the scoring of a very limited number of current criminal statutes tiiat do not categorize the crimes as person or nonperson offenses. See, e.g., K.S.A. 21-4213 (unlawful failure to report a wound is a “class C misdemeanor”); K.S.A. 21-4218 (unauthorized possession of a firearm on the grounds of or within certain state buildings is a “class A misdemeanor”); K.S.A. 21-4312 (unlawful disposition of animals is a “class C misdemeanor”); K.S.A. 21-4409 (knowingly employing an alien is a “class C misde*319meanor”). And we believe it unlikely the legislature intended that K.S.A. 21-4710(d)(8) govern all pre-1993 convictions.
There is no statutory mechanism either through K.S.A. 21-4710(d)(8) or another KSGA provision allowing us to draw a distinction between the current guidelines sentencing statutes and the pre-1993 criminal statutes. We hold that Murdock’s two prior out-of-state convictions must be scored as nonperson offenses under K.S.A. 21-4710(d)(8) following our controlling Williams precedent. We recognize this rule results in the classification of all out-of-state pre-1993 crimes as nonperson felonies—an outcome the State characterizes as unreasonable. But the solution to the State’s complaint sits with the legislature.
As noted above, the legislature enacted K.S.A. 21-4724(c)(l), instructing the Department of Corrections to recalculate certain inmates’ criminal histoiy classifications “as if the [prior] crime[s] were committed on or after July 1, 1993.” The legislature can amend the KSGA to address this issue as well if it deems an amendment appropriate.
We overrule all Court of Appeals decisions applying the rule recited by the Court of Appeals panel in this case. We reverse the Court of Appeals and the district court and remand for resentenc-ing with directions to classify die prior out-of-state convictions as nonperson offenses.